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Sedans Acura TSX Acura TSX Real World MPG Numbers
221 messages, Last post on Sep 21, 2009 at 2:10 PM
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Replying to: fjpthree (Aug 03, 2008 1:05 pm)
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Replying to: haidongh (Aug 23, 2008 6:07 pm) |
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I have an 08 TSX that has now done about 4600 miles. With every gas receipt I have been recording mileage and gas used. I have noticed two things with the car: 1) The trip miles - reset at each fill - does not total the total mileage accumulated. It is typically 1 to 2 miles lower on each fill than the total mileage being accumulated on the car. Initially I thought this was just me not resetting the mileage in time, but since I have been aware of it, I have deduced that it is the trip computer than can not add up, and not me. 2) The average mileage per gallon that is calculated on the trip computer is over calculated. Typically it reads 2 to 3 MPG over and above what I am calculating. Now I understand that by filling on different pumps that the gas used may be sightly under or over read, but it usually balances out over a few fills. But I am not seeing this. Take for instance, my last few fills. Last one was recorded at 29.9MPG by the car, 27.7MPG by me. The one previous to that was 29.8MPG by the car, 27.5 by me, and the one prior to that was about 27-28MPG by the car and 25.9 by me. I don't remember this last one exactly but it was significantly off and was the point that sparked my interest in the accuracy of the trip computer. It seems to be consistently off. I am now adjusting my spreadsheet that I use to calculate my gas mileage to track the trip computer totals as well, just to see how bad the trip computer is. Has anyone else been seeing this?
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Replying to: kjnorman (Aug 25, 2008 6:26 am)
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Replying to: rickpoole (Aug 25, 2008 7:47 pm) |
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Replying to: kjnorman (Aug 25, 2008 6:26 am) |
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on the assumption that the vast majority of the motoring public couldn't calculate MPG manually if their lives depended on it. Every other item on my '08 TSX (currently ~9K mi) is within a percent or two of what it should be (speedometer, odometer, outside temp, etc), but the computer is consistently 2-2.5 mpg high (varied from 35.5 indicated vs. 33.47 calculated to the more typical around-town 28.5 mpg indicated vs. ~25.8 actual). Since the computer works off the fuel injector pulse length & other parameters, I wouldn't expect the numbers to line up perfectly, but I would expect it to be low as often as it's high and to average out pretty close to reality. It's absolutely clear that that's not the case. Sounds like it was real back in '06, but got "tweaked" for the '07 and subsequent model years. I'm sure that extra 2 mpg is selling a few more TSXs via word-of-mouth. Either way, I'm quite pleased with my gas mileage, given the car's performance, even when it's calculated correctly. As to the dealer being able to adjust/correct it, I'd be beyond stunned if such a thing were possible, or even desireable, given the number of times dealer service departments foul up things that had nothing to do with the initial "issue," while not fixing that either.
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Having a touch of OCD and a full Ph.D., I have always recorded miles traveled and gas paid for with each fill-up. For both the '04 and '09 (now 5,000mi) the "real" number is always 2-3 mpg below the TSX screen number. Now, this could be a cheat by Acura.......or it could be a systematic cheat by the pump gauges (doesn't take much at $4,00/G to greatly increase profit margins). [Prompted by a recent fill-up at a BP station that put 18.3 G into a 18.5 G tank ('09) and I know I had more than a G left.]
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Replying to: deong (Aug 26, 2008 4:27 pm) That said, I've run into several (usually off the beaten path) stations that were keeping their thumb on the scale. What I've seen on my TSX computer covers dozens of different pumps/stations in several states. It's very consistent. Jiggery-pokery for sure.
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Replying to: cdnpinhead (Aug 26, 2008 4:53 pm) |
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