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Old 10-04-2012, 03:39 PM   #2051
myrt1987
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Originally Posted by foghelmut View Post
Did it for another tank, more consistently, got 26.9. I fill up twice a week, that adds up pretty quick. I'm going to be driving much slower.
is that mostly highway? thats pretty bad. are you weaving through traffic?
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Old 10-04-2012, 03:49 PM   #2052
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You think 27 mpg is bad for 80 mph? At that speed, I would expect a sub-30 mpg average.
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Old 10-04-2012, 04:02 PM   #2053
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You think 27 mpg is bad for 80 mph? At that speed, I would expect a sub-30 mpg average.
i wouldnt as long as you werent changing speed. cruise control on typical highway grades i would guess 33 mpg for 80% hywy trip.

but i thought he was going 70mph as per his prior email.
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Old 10-04-2012, 04:28 PM   #2054
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Quote:
Originally Posted by myrt1987 View Post
is that mostly highway? thats pretty bad. are you weaving through traffic?
My commute each way is about 5 miles of suburban road, and 37 miles of highway. Very little traffic for about 27 of those miles, so I'm neither drafting or weaving. I was not using cruise control either, and I wasn't changing speed much.

I was averaging 29.5 while doing 70 mph on the highway. I'm going to take it down to 65 for a few tanks.

At 65 mph, it should take roughly 34 minutes to do the 37 miles.
At 80 mph, it should take roughly 27.5 minutes to do the 37 miles.

I can leave the house 7 minutes earlier if it will save me some cash.
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Old 10-04-2012, 05:10 PM   #2055
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Quote:
Originally Posted by foghelmut

My commute each way is about 5 miles of suburban road, and 37 miles of highway. Very little traffic for about 27 of those miles, so I'm neither drafting or weaving. I was not using cruise control either, and I wasn't changing speed much.

I was averaging 29.5 while doing 70 mph on the highway. I'm going to take it down to 65 for a few tanks.

At 65 mph, it should take roughly 34 minutes to do the 37 miles.
At 80 mph, it should take roughly 27.5 minutes to do the 37 miles.

I can leave the house 7 minutes earlier if it will save me some cash.
For some reason i can't. My commute sounds identical
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Old 10-04-2012, 07:47 PM   #2056
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Originally Posted by myrt1987 View Post
i wouldnt as long as you werent changing speed. cruise control on typical highway grades i would guess 33 mpg for 80% hywy trip.
The EPA tests cars at what, 55mph? 80mph is significantly higher than that, so I would expect mpg's to drop well below 30 as well. Just to be expected.

http://www.dieselnet.com/standards/cycles/hwfet.php
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Old 10-04-2012, 07:59 PM   #2057
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I've had my Impreza since January and have put about 4500 miles on the car so far. My commute to work is about 8-9 miles one way and it's all surface streets, no highway. If I drive conservatively I average about 29.5-30 mpg. When I don't drive as conservatively, I think the lowest I've seen was just under 28mpg.
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Old 10-04-2012, 08:51 PM   #2058
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I think the biggest factors for me have been outside air temp, engine temp, type of fuel (ethanol based vs. not), outside wind direction, terrain and traffic. All of those seem to play into the mpg factor.
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Old 10-04-2012, 09:01 PM   #2059
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He's averaging 44 MPH. This video is a lie. Notice that there is no tenths column in the number. What a jackarse.
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Old 10-04-2012, 09:28 PM   #2060
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What happened to the video??
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Old 10-04-2012, 10:23 PM   #2061
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Didn't think to check my tires this morning before going to work. My gas mileage sucked this morning big time, but not just due to underinflated tires they was also 3"of slush i was plowing though and a 40mph headwind. Was getting 23mpg at 55mph.

Tonight with a 15mph tailwind i was only getting 28mpg at 75, which i know is low. Car was also sluggish in the handling department. When i got home after my 41 mile commute u checked my tires and they were all below 30, the front were down 6, while the back were down 5. Overinflating didn't seem to help much but underinflated site makes a big impact!
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Old 10-04-2012, 10:43 PM   #2062
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Quote:
Originally Posted by flyboy1100 View Post
Didn't think to check my tires this morning before going to work. My gas mileage sucked this morning big time, but not just due to underinflated tires they was also 3"of slush i was plowing though and a 40mph headwind. Was getting 23mpg at 55mph.

Tonight with a 15mph tailwind i was only getting 28mpg at 75, which i know is low. Car was also sluggish in the handling department. When i got home after my 41 mile commute u checked my tires and they were all below 30, the front were down 6, while the back were down 5. Overinflating didn't seem to help much but underinflated site makes a big impact!
So what would you say is the ideal psi to inflate your tires to for a balance between handling (driveability) and mileage?
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Old 10-04-2012, 10:51 PM   #2063
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Quote:
Originally Posted by pkL

So what would you say is the ideal psi to inflate your tires to for a balance between handling (driveability) and mileage?
I like 34/32. 38/36 was loose feeling and 32/30 feels mushy
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Old 10-04-2012, 11:15 PM   #2064
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Quote:
Originally Posted by sgoldste01 View Post
I think Stevehnm's point is that if two different model cars from two different manufacturers receive the same estimated EPA mileage (regardless of whether one of those cars is AWD or not), then you would expect those cars to deliver similar mileage if they were driven "in the real world" by the same driver, on the same roads, using the same gas, etc.

Stevehnm isn't saying (and he'll correct me if I'm wrong) that the Impreza should necessarily meet or beat its EPA's estimates. He's saying that if the Impreza can't meet or beat its EPA's estimates, then the Corolla (which he says has the same EPA estimate as the Impreza) shouldn't meet or beat the EPA's estimates either.

It's a good question. He owns a Corolla and an Impreza. They both have the same EPA estimates. Why can't he get the same real-world fuel economy from both? Your answer should not be "Because the Impreza is an AWD car", because if that's the excuse, then my follow-up question will be "Then how did the Impreza manage to achieve the same EPA estimate as the front-wheel drive Corolla?"

Don't get me wrong. I'm not complaining about my Impreza's fuel economy. I'm simply explaining how people seem to be misinterpreting Stevehnm's legitimate question.
First off, approaching 10k miles I average 34.5 mpg without trying much (drive 60-70), and I've hit 38 mpg over a full tank of gas "grannying" for nearly 500 miles mixed driving, so I'm ho-hum about the EPA estimate arguments. To the point above though, how about this: Cd for the 2004 Corolla is .30, . Cd for the 2012 Impreza is .31/.33 (4d/5d). (Hey out there, are the sedans getting better mpg's than the hatches??)

Drag on the car increases by the square of speed (says Wikipedia), not linear. So, the faster you go the more the effect of the drag difference is amplified. If you like to drive faster than EPA uses for estimates, you could expect to to see the lower drag car get better mileage than the higher Cd car all else being equal. Sort of makes sense to me, but I have to leave the math to others. Interesting post on efficiency in this forum at
http://forums.nasioc.com/forums/show...5&postcount=14, don't know if he's right - says power required increases by ^3 with speed..
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Old 10-05-2012, 01:09 AM   #2065
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Quote:
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I like 34/32. 38/36 was loose feeling and 32/30 feels mushy
Ok thanks and how is the weather like in North Dakota at this time of the year?
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Old 10-05-2012, 06:13 AM   #2066
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Quote:
Originally Posted by flyboy1100 View Post
I like 34/32. 38/36 was loose feeling and 32/30 feels mushy
I use 35/33 cold inflation pressure, after driving less than two miles to the gas station's air pump.
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Old 10-05-2012, 06:32 AM   #2067
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Quote:
Originally Posted by pkL

Ok thanks and how is the weather like in North Dakota at this time of the year?
Crappy. Averages are supposed to be low 60's, instead we got snow yesterday. Thankfully it is all gone and next week should be back towards average
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Old 10-05-2012, 07:32 AM   #2068
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We are getting an early Fall out here so I am hoping for early snowfall this season.
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Old 10-05-2012, 11:52 AM   #2069
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My normal commute is 12 miles each direction, all highway with hills and sometimes windy. I lock the cruise control at 70 mph and average 26 mpg.

This weekend, I took a 120 mile trip each direction. Again locked the cruise control at 70 mph. I estimated that I was on my way to 32 mpg but Fuelly shows I only managed 28 mpg!

I ride my motorcycle half the time for my commute. I can get 40 mpg like everybody else with my bike. I don't think the problem is my route, I think it's my Impreza. The low MPG is very disappointing to me.
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Old 10-05-2012, 12:02 PM   #2070
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Even after airing up my tires i was only managing 23mpg this morning again at 81mph into a 30mph headwind. So i guess that isn't bad as the car was seeing a combined 110mph wind, but still. Temp was 31f
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Old 10-05-2012, 12:30 PM   #2071
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get a sedan. im avg 39mpg, digital readout 42mpg
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Old 10-05-2012, 12:40 PM   #2072
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Even after airing up my tires i was only managing 23mpg this morning again at 81mph into a 30mph headwind. So i guess that isn't bad as the car was seeing a combined 110mph wind, but still. Temp was 31f
that is why your fuel economy was so poor.
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Old 10-05-2012, 01:16 PM   #2073
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Quote:
Originally Posted by 53x12

that is why your fuel economy was so poor.
Took a long time to see that too, maybe 18 miles to get everything warmed upi think.

I used to see around 26-27 at the same speed but not as much wind and not as cold
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Old 10-05-2012, 03:23 PM   #2074
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im sure type of impreza makes a difference too. MT vs cvt, sedan vs hatch. MT has 50/50 power split besides having only 5 gear ratios. cvt isnt always a 50/50 power split. These differences plus C_d apparently being different could add up. More reasons im happy with my decision.
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Old 10-05-2012, 04:14 PM   #2075
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After my first 380 miles, about 70% highway, 30% city, my average is 30.1. Very pleased!
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