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Acura TSX Real World MPG Numbers

221 messages,  Last post on Sep 21, 2009 at 2:10 PM

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What is this discussion about? Acura TSX, Fuel Efficiency (MPG), Sedan

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#204 of 221 Re: Trip computer is way off my manually calculated MPG [kjnorman] by rickpoole Aug 25, 2008 (7:47 pm)
Replying to: kjnorman (Aug 25, 2008 6:26 am) I found this to be true in my 07 TL. Most of the time the trip computer reads 8-10% too high. This past weekend I had an 09 TSX while my TL was in the shop and used 1/2 a tank and compared the real mileage to the indicated mileage and it too read about 10% too high. No one at any dealer or at Acura has been able to explain why their trip computers all seem to display number that are consistently 5-10% too high. Replies to this message: nj2pa2nc (Aug 26, 2008 3:51 am)
#205 of 221 Re: Trip computer is way off my manually calculated MPG [rickpoole] by nj2pa2nc Aug 26, 2008 (3:51 am)
Replying to: rickpoole (Aug 25, 2008 7:47 pm) We have found the trip computer to be the same or very close (less than 1%) on our 06 tsx when we compare it to our manual calculations for MPG.
#206 of 221 Re: Trip computer is way off my manually calculated MPG [kjnorman] by obladida1 Aug 26, 2008 (4:05 am)
Replying to: kjnorman (Aug 25, 2008 6:26 am) I have an 07 auto/navi TSX and this summer I sadly discovered the exact same thing. The trip computer is off by 1.5 to 2 MPG in its favor on EVERY tank fill. For about a year I thought I was averaging over 29 MPG, but the reality is that I'm only getting around 27. I am extremely disappointed. Can the dealer fix this?
#207 of 221 It's PR BS, Based. . . by cdnpinhead Aug 26, 2008 (5:24 am)
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. Replies to this message: obladida1 (Aug 26, 2008 9:16 pm)
#208 of 221 '04 vs '09 by deong Aug 26, 2008 (4:27 pm)
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.] Replies to this message: cdnpinhead (Aug 26, 2008 4:53 pm) deong (Aug 26, 2008 5:30 pm)
#209 of 221 Re: '04 vs '09 [deong] by cdnpinhead Aug 26, 2008 (4:53 pm)
Replying to: deong (Aug 26, 2008 4:27 pm) Well, in the states (and provinces) that I've lived in, the government shows up regularly (unannounced, I think, yearly or every two years) with their little five-gallon containers with the long neck and sight glass so that they can verify that every pump on the premises is within a fraction of a percent of what it should be. There's temperature correction for the volume and the whole bit. I believe that the vast majority of gas stations are legit.   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. Replies to this message: deong (Aug 26, 2008 5:30 pm)
#210 of 221 Re: '04 vs '09 [cdnpinhead] by deong Aug 26, 2008 (5:30 pm)
Replying to: cdnpinhead (Aug 26, 2008 4:53 pm) ..so maybe it's my hp33s...? Durn RPN. (Never got close for some 50,000 mi).
#211 of 221 Re: It's PR BS, Based. . . [cdnpinhead] by obladida1 Aug 26, 2008 (9:16 pm)
Replying to: cdnpinhead (Aug 26, 2008 5:24 am) The frustrating part is that I know it is possible for the computer to get it much closer than a 1.5 to 2 MPG difference. My wife's 06 Toyota Sienna is 75% dead on with an occasional +/- 0.1 or 0.2 difference.
#213 of 221 MPG numbers from my trip by abhiutd Jul 16, 2009 (8:26 am)
Last week i made trip to Niagara (440 miles) and set up the cruise for the first time at 61 and 71 on 55mph and 65mph limits respectively. Got an unbelievable mileage of 37.5 mpg (my manual calculation). Computer was reading 38.8 mpg. From now on i will be using cruise way more often on long trips. I have a 06 TSX Automatic, 25k.   cheers!

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