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Does the Trip Computer Lie About MPG?

10 messages,  Last post on Jan 22, 2009 at 4:48 PM

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#3 of 10 It's definitely not instaneous reading and its definitely above 30 by idavidson Jan 16, 2009 (3:04 pm)
I parked it overnight and it reset as you describe (as an aside you can turn off that feature).   This morning I drove 1 mile to get on the freeway (said it used about 15 mpg) then 25 miles on the highway at 55 mph (the average mpg crept upto 33mpg) and then one mile on suburban streets to get to work (average mpg crept down to 32.5mpg).   Could it be because I'm babying the engine? It's in the burnin period so I'm accelerating very very slowly. Just staying in the right hand lane, not overtaking, steady at 55, 58mph. Getting lots of fingers and rude signs, but that's another story! Replies to this message: comem47 (Jan 16, 2009 5:26 pm) toomanyfumes (Jan 17, 2009 9:03 am) idavidson (Jan 17, 2009 10:13 am)
#4 of 10 Re: It's definitely not instaneous reading and its definitely above 30 [idavidson] by comem47 Jan 16, 2009 (5:26 pm)
Replying to: idavidson (Jan 16, 2009 3:04 pm) "I parked it overnight and it reset as you describe (as an aside you can turn off that feature). "   I have a 2007 and I found that while the manual described a way to change it, the mode resets when you turn off the ignition, so I was always back to square one. Many people (at least with 2007s) are frustrated that you can't keep a running total average MPG over a tank if say that tank takes you 5 days . (to be able to get up in the morning and still find it at the last reading of say 25 cumulative MPG, vs going though it displaying like 15 mpg till you have driven maybe 20 miles to bring the new average back up) If I drive it enough miles on the highway before shutting it off the reading is pretty close to what you actually are getting by taking the trip odo miles divided by the fill up gallons, but otherwise the indicated MPG will be much lower than actual (not enough time so display a real average)   Note that I do not have the Nav package, which I believe gives you better access to programming features. Replies to this message: toomanyfumes (Jan 17, 2009 9:03 am) idavidson (Jan 17, 2009 10:13 am)
#5 of 10 Re: It's definitely not instaneous reading and its definitely above 30 [comem47] by toomanyfumes Jan 17, 2009 (9:03 am)
Replying to: comem47 (Jan 16, 2009 5:26 pm) I've tried babying it on the highway to get the highest mileage possible and have never gotten above 29 MPG. (2007 LS V6 4WD) Replies to this message: idavidson (Jan 17, 2009 10:13 am)
#6 of 10 Re: It's definitely not instaneous reading and its definitely above 30 [too by idavidson Jan 17, 2009 (10:13 am)
Replying to: toomanyfumes (Jan 17, 2009 9:03 am) > I've tried babying it on the highway to get the highest mileage possible and have > never gotten above 29 MPG. (2007 LS V6 4WD)   Okay, so its not out of the realms of possibility since mince is a 2WD. Also, it was just me (200 pounds) and nothing else.
#7 of 10 It Does Not Lie! by idavidson Jan 22, 2009 (9:02 am)
Hi,   Just finished my first tank of gas.   404 miles, 12.5 Gallons put me at around 32 mpg. But as I said for the first 300 miles I babied the engine.   As an aside I did two experimental trips:   25 highway miles at 55 mph: I got 35 mpg according to TC. 25 highway miles at 50 mph (the manual recommends this as a speed to maximize fuel economy): I got 40 mpg.   But let me tell you that driving at 50 mph on CA highways is dangerous!!! Replies to this message: costello1 (Jan 22, 2009 12:51 pm)
#8 of 10 Re: It Does Not Lie! [idavidson] by costello1 Jan 22, 2009 (12:51 pm)
Replying to: idavidson (Jan 22, 2009 9:02 am) I don't put a whole lot of faith in the computer .This may sound stupid but I have notice driving to and from a destination that the MPG coming and going at the same speed and conditions can vary by 3-5 MPG. I usually never go over 60 mph . I guess the best way to judge is to fill the tank complety and replace the used gas and then divide by the miles driven . By the way , the best I ever got was 29 MPG and I have the XLS 4Wd .
#9 of 10 by wheel_dawg Jan 22, 2009 (4:11 pm)
Let's just say that the computer is 'optimistic' - usually by 2 mpg at least.   I don't think it's fair to quote anything but the mileage that you've calculated based on miles traveled / gallons used. Anything else is phony.
#10 of 10 Right wheel_dawg by idavidson Jan 22, 2009 (4:48 pm)
The only true measure is miles driven / gallons consumed. But it seems that the trip computer is fairly accurate approximation to that based on what I've seen.

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