On Wed, Oct 21, 2009 at 8:48 AM, Loren Busch <starwagen@gmail.com> wrote: > RE: Calculating gas mileage > A question for all those reporting gas mileage. How are you calculating > your numbers? Are you using the odometer/speedometer on the dash? or are > you > using the trip meter on a GPS? If using the odometer, have you calculated > the error in your speedo and odo and figured that in? Are you running > stock > wheels and tires and if not have you figured the error induced with non > stock tires? > For my figures, obtained over the past 40k miles I have logged since I got my 84 inline 4 5sp without the westie top, I've always used my Odo readings and figured the mileage using my calculator as I fill up, almost every tank. I confirmed my speedo was accurate to 1% with my previous odo. Recently I swapped in a new speedo/odo and confirmed this one to be 2% optimistic..100miles on the odo is actually just 98miles on gps...so that seems close enough for posting mpg to the list. 23mpg over all is the figure I use to calculate cross country trip costs. (day to day driving that is the figure, too). Using that figure I usually have enough $ left over for a dinner out or a motel room along the way should I find myself in a nasty urban area when I get really sleepy on a road trip.. Don Hanson |
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