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Old 09-09-2012, 08:33 PM   #1826
jsteg
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Quote:
Originally Posted by ans2k

while looking up tires and their specs. i notice that the S34 oem tires are 25.2 tall(overall diameter) and tires such as G-max and DWS are only 25.1 inches tall. that means, that those tires will be closer to the odometer calculation and slower to the speedometer than the oem tires. just food for thought
Eh, I don't know man. 1/10th of an inch is pretty minuscule.
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Old 09-09-2012, 09:24 PM   #1827
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Did you drive a Civic HX?
125 HP sleds. It's getting close to having some more high-speed fun.
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Old 09-10-2012, 09:37 AM   #1828
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Just a side note- I put DWS's on my car and noticed a definite crispness in handling compared to the S34's. On the downside road noise increased and with the tires at 34/32 a little harder ride/ I'm sure they will be better in the snow, but to be honest the s34 is a good tire. I installed my S34's on my son's 10 prez and it made a big difference compared to the OEM Bridgestones.
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Old 09-10-2012, 10:08 AM   #1829
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getting way off topic:

???? DWS are known to have a soft side wall.
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Old 09-10-2012, 11:16 AM   #1830
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Just a side note- I put DWS's on my car and noticed a definite crispness in handling compared to the S34's. On the downside road noise increased and with the tires at 34/32 a little harder ride/ I'm sure they will be better in the snow, but to be honest the s34 is a good tire. I installed my S34's on my son's 10 prez and it made a big difference compared to the OEM Bridgestones.
I went from a FWD car with Conti DWS tires to a new AWD Impreza with Yokos during the winter last year.

The Yokos are not a good tire if any snow or slush is around. In many situations, the Impreza is significantly worse on bad roads than the DWS equipped car. There are a few people that defend the Yokos, and I am glad they find the Yokos acceptable, however in my experience the Yokos are some of the worst all-season tires I have ever had for winter driving. I've been living in Maine and driving in the winters for over 15 years.

Heck I have an old Outback with "What are the cheapest tires you have?" on it, and that handles snow and slush much better than the Impreza on the Yokohamas.
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Old 09-10-2012, 03:27 PM   #1831
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Since this is a MPG thread I will say that the Yokos are designed for higher MPGs. Change them and expect the possibility of a decrease in efficiency. I'm just sayin'.
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Old 09-10-2012, 03:57 PM   #1832
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lol I was just saying it has to spin 2x as many wheels. But with AT, the power split varies so its mostly fwd when cruising, so that saves gas. Its switches to 50/50 split when it feels wheels slipping

I think MT is always 50/50 split
Not quite. It is constantly calculating and altering the ratios based on prevailing conditions. It is not an on/off switch. It is more like a constantly moving target. But yes, under steady cruising it will behave mostly like a fwd to optimize mpg.
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Old 09-10-2012, 06:09 PM   #1833
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Originally Posted by ST Eye View Post
Since this is a MPG thread I will say that the Yokos are designed for higher MPGs. Change them and expect the possibility of a decrease in efficiency. I'm just sayin'.
Not having to drive in snow ever, I really like the Yoko's. They do well in the really rainy conditions we get here at times, and mine are wearing well.
I also agree that they are part of the lower-mpg equation, although, I don't think anyone would really notice too much in the real world when switching as long as the size is exactly the same. The stockers are definitely not the BEST tires out there, but I'd buy a low-mileage set of take-offs if the price was right.
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Old 09-10-2012, 06:21 PM   #1834
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I'm thinking about ordering some rally armor flaps, I wonder if they will have any effect on mpg's. I know it would be minimal. But I wonder, since this car was apparently designed with lowering wind resistance in mind. A new stickier set of tires, the mudflaps, and crossbars (if I do add them), and I could see losing a mile per gallon.
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Old 09-10-2012, 06:46 PM   #1835
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probably more. since the stock yoky are considered to be low rolling resistant and the crossbars are shown to decrease mpg by a % not not just 1 or 2 mpg. and mudflaps, you bet will be the same as crossbars. look for about a 5-7% decrease.
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Old 09-10-2012, 07:01 PM   #1836
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I don't have a problem with the Yokohamas. Not saying they are the greatest, but they suit me fine. I drove in light now last year with no issues. Will see how they are in deeper snow this year (maybe if it snows).
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Old 09-10-2012, 08:45 PM   #1837
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I haven't researched it, but it's my guess that car manufacturers must make their odometers within a certain percentage of perfect accuracy, and that our 2.7% inaccuracy falls within this range.

I also guess that as the tires wear, the odometer becomes more accurate, to the point where it's over-calculating distance by the time your tires' wear bars are exposed. So the distance calculation might be 2.7% low with new tires, 2.7% high with tires that are worn out, and just about perfect if averaged over the life of the tire.

So to your comment, no, I don't find this concerning at all.
That's what I thought. However, as Bill Clinton said at the DNC, does it pass the math test?

Assumption: Avid S30 tires on Impreza Premium. Diameter ~24.9 inches, 10/32 tread depth, driven to 3/32 tread depth.

Circumference drops by about 2.3%. So, when the tire is ready to be changed, the odometer will still be calculating slightly low (0.4%). If you take the average between 2.7% and 0.4%, over the life of the tire, roughly 1.5%-1.6% underreported mileage.
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Old 09-12-2012, 08:32 AM   #1838
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So I am not sure if I have the same issue. I bought my Impreza in April 2012, and I have been running it for the last 5 months. I figured I would google this issue and found this thread.

How do I tell what update is on my computer? Is there a way I can check?

The reason I am asking is because the dealership is saying that the car does not need the update. The issues that I have been having are very similar to the issues that everyone else has been reported so far.

One of the biggest and the most annoying issue is (again my legacy 2011 model does not do this and my Honda accord which I know doesn't have a cvt transmission doesn't do this as well), is when I am going down a very steep hill, the rpm's jump to around 2.5k-3k. The engine is making a lot of noise. It does this all the time, even with small hills as well. My foot is not on the accelerator, I just let go of the accelerator and am not even breaking.

My other cars usually go up on speed when I go down hill, but this car does not which is really weird for me?

Can anyone help?

Thanks.
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Old 09-12-2012, 09:48 AM   #1839
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Originally Posted by rpatel
So I am not sure if I have the same issue. I bought my Impreza in April 2012, and I have been running it for the last 5 months. I figured I would google this issue and found this thread.

How do I tell what update is on my computer? Is there a way I can check?

The reason I am asking is because the dealership is saying that the car does not need the update. The issues that I have been having are very similar to the issues that everyone else has been reported so far.

One of the biggest and the most annoying issue is (again my legacy 2011 model does not do this and my Honda accord which I know doesn't have a cvt transmission doesn't do this as well), is when I am going down a very steep hill, the rpm's jump to around 2.5k-3k. The engine is making a lot of noise. It does this all the time, even with small hills as well. My foot is not on the accelerator, I just let go of the accelerator and am not even breaking.

My other cars usually go up on speed when I go down hill, but this car does not which is really weird for me?

Can anyone help?

Thanks.
That's engine braking. In this car you can't coast down a hill. This keeps you at speed. You can paddle up shift to prevent this. But it is normal. The updates were for problematic engine braking & drivability & came out in Sept & Nov 11. If your build date (on inside of driver side door) is Dec 11 or later your software is more than likely up to date.
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Old 09-13-2012, 11:24 PM   #1840
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Default Satisfied with mileage

Well my mpg has been pretty good since I passed 4k miles (and the first oil change). On a trip to up-state NY with the family, four in the car and full luggage, uphill on the Pike from MA, 75 mph and AC blasting, we got 30.4 mpg on the tank - darn good! Since then I'm averaging around 34.5 at each fillup, and I've hit 37.2 over 444 miles commuting when "hypermiling". Put areo roof rails on two tanks ago and still trying to decide what effect it's having - maybe .5 to 1.0 mpg off, no more. Definitely possible to meet epa mpg estimates. Cheers.
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Old 09-13-2012, 11:30 PM   #1841
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For the heck of it, i was going to enable the shift light on my car and try driving it based upon the computers recommended shift points and see what kind mileage results
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Old 09-13-2012, 11:36 PM   #1842
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Originally Posted by SleepNMnky View Post
Just got back from a round trip venture from Buffalo, NY down to Charlotte, NC. My numbers are disappointing but I'm sure there's some factors that contributed to it.

1,352 miles round trip - 30.2 MPG - 62 MPH average

#1 - even though my odometer appeared to be spot on when initially testing it with my GPS, over the longer run, it appears to be just under 2% off in my favor. The odometer is reporting 2% less miles than I'm actually putting on the car. I've accounted for that in my calculations & have adjusted all of my Fuelly logs by this percentage. My overall average MPG on Fuelly has only gone up by less than .5 MPG but it makes my gauge more accurate.

http://www.fuelly.com/driver/sleepnmnky/impreza

#2 - hills & speed. this was a hilly run with just as many steep uphills & gradual uphills to even out any down hill gains. also the average speed limit was 65 mph, some areas at 70 mph. on average i tend to drive 10-15 miles over, sometimes up to 20 miles over. there were a number of long runs that i was consistently driving 80 mph & 90 occasionally. didn't help that there was an acura playing leap frog with me all through west virginia that wanted to race. why race me? no hood scoop here. but i HAD to entertain him just a little. so the speed hurt me, speed on top of hills... really hurt me.

#3 - i kept the windows/moonroof closed most of the trip. AC was on intermittently but at a low speed. i don't think this affected the MPG much at all.

#4 - used cruise about 40% of the time & tried to utilize some coasting the rest of the time to try to improve the #s, it helped only the tiniest bit.

overall - disappointed, but it is what it is. i fall within the EPA ranges, & someone's gotta be at the bottom for them to exist. i guess that bottom figure will always be me. i'm still happy overall, AWD averaging close to 30 mpg. sure as hell beats my last car... & i love everything else about this car. i'm done obsessing but will continue to take some advice from the group & will probably continue to be jealous of those with the good #s. i will continue to update Fuelly for those that are interested.
Those runs at 80 and 90 MPH and the hills prolly are what killed your MPG for the trip. Had some fun with the gas pedal on my Impreza on a nice long straightaway, and watched the MPG's rapidly drop because of it. Said it before, the 'sweet spot' for this car appears to be around 55 MPH. Long runs on the flat at that speed will get you window sticker numbers or better. Interstate driving in the high 70's is going to put you in the high 20's MPG, lower 70's will put you into the low 30's.
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Old 09-13-2012, 11:53 PM   #1843
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Originally Posted by cny12owner

Those runs at 80 and 90 MPH and the hills prolly are what killed your MPG for the trip. Had some fun with the gas pedal on my Impreza on a nice long straightaway, and watched the MPG's rapidly drop because of it. Said it before, the 'sweet spot' for this car appears to be around 55 MPH. Long runs on the flat at that speed will get you window sticker numbers or better. Interstate driving in the high 70's is going to put you in the high 20's MPG, lower 70's will put you into the low 30's.
I concur. I know the higher speeds killed my #s. I didn't think the faster speeds would effect it quite as much as they didn't cause such a big hit on previous Hondas. But from what everyone else is posting they all seem to be hitting around 30 at those speeds too. I'm okay with it. I like to drive fast & am willing to take the hit for it. I DO know how to "granny" it & hypermile, but I love driving way too much to punish myself for a few extra MPG. I'm quite happy with my MPG based on my driving. Prior to the TSB updates though my numbers were crazy low. Now they're acceptable.

Last edited by SleepNMnky; 09-14-2012 at 01:11 AM.
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Old 09-14-2012, 12:06 AM   #1844
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I concur. I know the higher speeds killed my #s. I didn't think the faster speeds would effect it quite as much as they didn't cause such a big hit on previous Hondas. But from what everyone else is posting they all seem to be hitting around 30 at those speeds too. I'm okay with it. I like to drive fast & am willing to take the hit for it. I DO now how to "granny" it & hypermile, but I love driving way too much to punish myself for a few extra MPG. I'm quite happy with my MPG based on my driving. Prior to the TSB updates though my numbers were crazy low. Now they're acceptable.
You are getting similar MPGs as me. I wish you didn't have to try so hard to get good mileage. But it is what it is. At least it's a good car overall.
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Old 09-14-2012, 12:53 AM   #1845
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I concur. I know the higher speeds killed my #s. I didn't think the faster speeds would effect it quite as much as they didn't cause such a big hit on previous Hondas. But from what everyone else is posting they all seem to be hitting around 30 at those speeds too. I'm okay with it. I like to drive fast & am willing to take the hit for it. I DO now how to "granny" it & hypermile, but I love driving way too much to punish myself for a few extra MPG. I'm quite happy with my MPG based on my driving. Prior to the TSB updates though my numbers were crazy low. Now they're acceptable.
Tough adjustment for me, used to drive a Toyota Corolla, and could get the high MPG's on the long haul, high speed interstate runs. I didn't see a significant dropoff in MPG's until I got up to some crazy-fast speeds. With this car, on the interstates, I'm just writing the lower MPG's off to having to drive faster to go with the flow, and not creating a hazard by trying to hypermile. I'm not going to complain about tanks in the 28-30 MPG range. I have more of an issue holding 55 on the two-lane, and as a result I sometimes see lower MPG's that I'm happy with there. I know I can get high 30's to low 40's for MPG's there. But the car is so much fun to drive, sometimes it's just MPG's be damned, I'm gonna have some fun and drive a little faster.
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Old 09-14-2012, 04:00 PM   #1846
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Just had my car for a week, ran for 305miles with mix local and highway, only get 25MPG. Can't wait the breakin period over, so I can see some 30+MPG
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Old 09-14-2012, 05:31 PM   #1847
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Originally Posted by winglik
Just had my car for a week, ran for 305miles with mix local and highway, only get 25MPG. Can't wait the breakin period over, so I can see some 30+MPG
Same boat. I'm getting 27mixed highway city. If I fill up and get immediately on the highway, zero the trip meter, freshly washed, keep it under 70 with a tailwind, I got up to 42.3 once, but then got off the highway and it went downhill from there.
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Old 09-14-2012, 06:36 PM   #1848
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I concur. I know the higher speeds killed my #s. I didn't think the faster speeds would effect it quite as much as they didn't cause such a big hit on previous Hondas. But from what everyone else is posting they all seem to be hitting around 30 at those speeds too. I'm okay with it. I like to drive fast & am willing to take the hit for it. I DO know how to "granny" it & hypermile, but I love driving way too much to punish myself for a few extra MPG. I'm quite happy with my MPG based on my driving. Prior to the TSB updates though my numbers were crazy low. Now they're acceptable.
so im asian and i just crunch some number. assuming driving 20K miles a year and gas prices are at 3.79$/gallon. if you granny drive vs driving fast you are losing 6 mpg. say 36 mpg for granny and 30 for mr. fast and furious. that is 2109.34 for granny a year for gas and 2526.66 for fast and furious. that is a loss of 417.32 a year. just saying.
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Old 09-14-2012, 10:03 PM   #1849
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You guys are very lucky.. The best I've been able to do is 21mpg (mixed city and hwy)... For '13 STi.

Ange
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Old 09-14-2012, 10:16 PM   #1850
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You guys are very lucky.. The best I've been able to do is 21mpg (mixed city and hwy)... For '13 STi.

Ange
You're comparing a STI vs a 2.0i Impreza. BTW, 21MPG on an STI is good! I usually get 18-19.
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