Senior TN Member
Join Date: Jun 2005
Location: Boulder CO
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Brief update, I can't yet trust direct results from the scangauge but I'm gaining respect.
First I've calibrated the odometer, and until I do a long trip I think the odometer is 1% low with the taco reading 20 miles to the mile marker reading 19.8. The Scanguage allows adjustments by 1% and that seemed to take up the slack though I'm not convinced that individual interstate mile markers are really that precise, over the 20 miles there was some variation.
Second, the mph is off by more than a bit, at a solid 62 by the scanguage, (using the same odometer adjustment) the taco gauge is reading 65-6. If people are passing you at 65 there's a reason. Of course with at least 6 different rear gear/tranny/tire combos, your combo may vary, odometer as well of course.
3rd, even with the above factors I'm getting a per trip mpg of 32-34 mpg on my daily commute with the 2.7l of 9 miles mostly 45 and 55 with a few stoplights. This jives with the 29.5 mpg from my first tank, I'm hoping to improve on this my 3rd tank.
My gas usage is just a sensor estimate until I cailbrate with a few tankfuls. On my first fill up since getting the scangauge I'll indicate FILLUP, and then at the next fillup it will tell me what it estimated I used, and I'll correct it if necessary with actual fill volume, and it will establish an error. On subsequent fillups i'll refine this error or conclude it isn't accurate? So far it seems reasonable.
Initial conclusion, driving habits have a HUGE effect on overall mpg. I have 8 stoplights to and from work. If I look ahead and anticipate stops and coast to stops, or never stop I can increase mpg from an oblivious 22mpg to a conscious 34mpg without getting to work any faster. I see a lot of people racing past me as I watch the scangauge mpg climb only to catch up or pass them at the next intersection.
I'm getting anal quickly, but if you want better mpg, it can be had, if you don't care how your "intake" sounds.