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08-15-2012, 04:58 PM | #1651 | |
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Vehicle:2018 WRX Pure der |
Quote:
70 miles one way, 3.5 hours per day meaning round trip, prob should have clarified. You want proof, Ill give you proof.
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08-15-2012, 06:01 PM | #1652 |
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Join Date: Apr 2012
Location: Bryant, AR
Vehicle:2012 Impreza Sport |
iffy but believable LOL. congrats
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08-15-2012, 09:04 PM | #1653 |
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Location: Twin Cities, MN
Vehicle:2012 Impreza CVT DarK Grey Met. Sport Prem |
Very nice! Truthfully the only reason I doubt the trip computer in general is because for me it has averaged 2.4mpg higher then actual between my first and second oil changes. My best tank on the gauge read 35.7 and turned into 32.1 calculated (and the tank before and after weren't wildly high to compensate).
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08-15-2012, 09:16 PM | #1654 |
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Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
My best on the gauge was 36, which calculated out to 34.5.
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08-15-2012, 10:58 PM | #1655 |
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I agree with that a lot! Drives me crazy.
It's fly-by-wire so a reflash with a different throttle map could improve that. The throttle mapping is my biggest complaint about the car. Here's my observations after 10,000 miles: From a dead stop, when I roll into the throttle gently, the acceleration is so slow that the people behind me start honking. If I roll just 1% or so more throttle the car leaps ahead with the possibility of rear-ending the car in front of me. So I have to immediately back off to zero throttle. Once there is sufficient room in front of me to not slam into the car in front, I gently roll on some more throttle. I get to a point where it feels like a good compromise between economy and acceleration and things go fine up to about 40 mph, then suddenly all acceleration stops and the car sticks at like 42 mph. Since I need to get to 60 on this one particular street I drive frequently I need to roll on more throttle to accelerate some more. At that point, unless I apply lots of throttle, acceleration is very poor and sluggish. When I get to my desired 60 mph I have to back off the throttle again to keep from accelerating more. The whole map feels very non-linear and stair-steppy. |
08-15-2012, 11:49 PM | #1656 |
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Vehicle:2012 Impreza CVT DarK Grey Met. Sport Prem |
Totally agree with the graphics! The only way it seems you can manage the first graph throttle response is to mash it down and rev up over 4k (not my style...usually) ...even then you'll have the fall off above 40mph.
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08-16-2012, 05:44 AM | #1657 |
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Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
OK, I'll ask again (to the right person this time): If you maintain speed on hills, how is what you're doing different from what the cruise control would do?
Additional questions:
I'm not saying I don't believe what you've managed to accomplish. I just think you're catching us all by surprise because it's so far above and beyond what people are showing on Fuelly, and beyond what we're seeing in our own cars. If you do keep records, I'd love to see your data entered into Fuelly. And if not, I'd love to see you start using Fuelly from this point forward, and then share your data with us. Here's mine: http://www.fuelly.com/driver/sgoldste01/impreza |
08-16-2012, 05:47 AM | #1658 |
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Join Date: Jun 2012
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Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
I'm assuming this is a CVT-specific behavior. I don't experience this with my 5MT.
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08-16-2012, 06:32 AM | #1659 |
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^ you are correct!
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08-16-2012, 08:00 AM | #1660 | |
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Member#: 322264
Join Date: Jun 2012
Chapter/Region:
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Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
Quote:
TomTom car GPS units (at least all the models I've owned) don't provide the ability to capture trip distance traveled out of the box (it will tell you how far you have to go, but it won't tell you how far you have already gone). However, one reason I'm loyal to TomTom is because of the ability to add 3rd party software to the unit. In this case, a freeware product called Tripmaster is what gave my TomTom the ability to report trip distances: http://www.webazar.org/tomtom/tripmaster.php?lang=uk I'm not very happy that my car's odometer is off by almost 3% (even if it is off to my advantage). I'd prefer accuracy. I know it's common for cars to report slower speeds on the speedometer (probably in the name of safety--"Let's tell him he's doing 60 MPH when he's really only doing 57!"). But I thought the odometers were generally accurate. I'm guessing it all averages out over time, though. As my tires wear out and the diameter gets smaller, the error should get smaller too, right? |
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08-16-2012, 08:50 AM | #1661 | ||
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Thanks!
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I have some hills to deal with, nothing too steep. I use whatever regular gas comes out of citgo pumps. 87e i think? I do try to draft behind trucks but have never seen an improvement in mpg. And I feel that its counter productive if i have to acc to drafting postion/ deccelerate so i dont hit them, then match their speed while they acc/decc at will. I dont blame you for not believing me. Its hard to believe everyone else only gets 25-32mpg in the same car. Dont really keep records but I have measured mpg at almost every fuel stop. First couple months calculating 35-36 mpg Increasing gradually and now calculating 38-40 mpg In both cases digital readout was ~2mpg higher (Highest ever being high 42+) EDIT: I also rarely use A/C as it drains mpg sufficiently. I know most people would think im crazy not using A/C on highways with windows closed, but fan is on and if its extremely hot i will use it. I would guess I lose about 3-5 mpg while using A/C Last edited by myrt1987; 08-16-2012 at 09:24 AM. |
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08-16-2012, 08:57 AM | #1662 | |
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08-16-2012, 10:35 AM | #1663 | |
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Vehicle:2012 Imp HB/Prem/CVT DCP |
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By now, my 'muscle memory' is pretty well set, so I can get the acceleration I need without thinking about it, so it's not a big deal for me, but I totally get your point. I haven't noticed the uneven acceleration, but I haven't paid attention to it. The engine itself has a pretty even power curve, so it must be the CVT. When accelerating, at certain points you can see the car accelerating without the tach. moving. It seems to behave differently when using the paddle shifters, more like a standard geared automatic transmission. |
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08-16-2012, 10:55 AM | #1664 | ||
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Quote:
Then the Impreza came out with this re-tuned lightweight "2nd gen" CVT, and a lot of reviews noted the car felt quick off the line, so Subaru probably accomplished what they were going for here. Quote:
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08-16-2012, 11:07 AM | #1665 | |
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Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
Check your odometer over longer distances/speeds. Mine seems to error higher at faster speeds |
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08-16-2012, 11:14 AM | #1666 | |
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Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
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I will continue to gather data before I commit any changes to my Fuelly data. I'd really prefer not to change my Fuelly data at all, because that will make Fuelly's "Total Miles Tracked" out of sync with what my car's odometer reads, which is weird. I'm having trouble accepting that my Fuelly Odometer might be more accurate than the odometer built into the actual car.... |
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08-16-2012, 11:20 AM | #1667 | |
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08-16-2012, 04:11 PM | #1668 | |
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Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
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i have found some variability, but all of my calcs (for drives of 20 or more miles come out to an underreported mileage in the 3-3.4% range. the speedometer always matches GPS measured speeds and also those digital readouts on the highway checking your speed. |
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08-17-2012, 02:39 AM | #1669 |
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Yes, my lumpy acceleration graph is with the CVT; I should have mentioned that.
For most of my driving I don't notice it very much. I have a few streets which I don't know how to properly describe -- maybe "high[er] speed surface streets." These are mostly straight with some elevation change, interurban, with signals a mile or so apart and speed limits at 55-60. For southern California people an example would be MacArthur Blvd. between Pacific Coast Highway and most of the way to Santa Ana. Jamboree, too. Every mile or so you have to accelerate from a stop to ~60 mph and this is where the lumpy throttle map is very noticeable. I drive this several times a week and so I keep getting reminded how much this mapping annoys me. I wanted the convenience of an automatic because I am so "over" having to row a stick shift in stop-n-go commuter traffic. But I am regretting my choice a bit now. This weird throttle mapping and the less-than-advertised gas mileage are my only semi-serious complaints. ____________ In some respects, CVT is fated to fight a losing battle. I don't know if anyone remembers the '80s when Cadillac had the 4-6-8 engines. They used all 8 cylinders when accelerating, then dropped to 6, then 4 for economy mode. This was before any cars were drive-by-wire and the technology would get completely confused. It could never figure out if it should upshift to overdrive or drop a couple of cylinders or both. The result was a VERY unsatisfying driver experience and Cadillac dropped the concept after a single year or maybe 2. Google it and you get articles such as "1981 Cadillac Fleetwood V-8-6-4 - The 50 Worst Cars of All Time" CVT gets into sort of the same bind. It needs to determine what your INTENTIONS are to operate smoothly. Thanks to all the sensors and decent programming it does a lot better than that horrible Caddy 4-6-8, but it still misses the point fairly often. We all know the the CVT is anything but "C". It goes up and down the RPM range with sometimes alarming extremes, especially when driving any hills. I believe one could make a tidy profit marketing remapped throttle curves. Best would be throttle maps which were switchable between über-economy, city, sport and highway modes. |
08-17-2012, 08:44 AM | #1670 | |
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Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
Quote:
Because I didn't want to lose the actual data as reported by the car's odometer, I decided to add another car to my Fuelly account. So now one tracks the odometer data as reported by the car, and the other tracks my adjusted odometer data. Here are the results: Running MPG Average Original: 31.1 Adjusted: 31.9 Best MPG Original: 34.5 Adjusted: 35.4 Miles Tracked Original: 3108 Adjusted: 3192 Cost/Mile Original: $0.115 Adjusted: $0.112 |
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08-17-2012, 08:51 AM | #1671 | |
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Sorry if I missed it- what average mph does the computer report when you are hitting toward your best mileage results? What highway speed do you limit yourself to? Per your other thread, I did find light drafting to be effective- obviously we need to define drafting.. I was keeping what I thought was sorta safe distance- 5 car lengths? Mythbusters proved that aggressive drafting is incredibly effective- but irresponsibly unsafe.
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08-17-2012, 09:09 AM | #1672 | |
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Join Date: Jun 2012
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Vehicle:2018 WRX Pure der |
Quote:
I dont really limit my highway speed, I actually find myself trying to go as fast as i can ... as long as the needle stays positive. So Ill accelerate to maybe 55 or something fast enough where i can enter traffic easily and then go from there. Well now that you said that im going to have to try drafting more. haha. i assumed it would only work at close range. |
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08-17-2012, 09:41 AM | #1673 | |
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Join Date: Apr 2012
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Vehicle:2012 Impreza Sport |
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08-17-2012, 10:14 AM | #1674 |
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Join Date: Jun 2012
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Vehicle:2018 WRX Pure der |
Oh wow, I wouldnt have thought at 100ft.
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08-17-2012, 11:43 AM | #1675 | |
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Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
Quote:
http://www.fuelly.com/driver/thewho/impreza |
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