Quote:
Originally Posted by strat61caster
The computer in the car is always optimistic in my experience, and not just on this car. If you flip through the manual I believe most cars with the feature have a disclaimer that this reading is an approximation and may not be accurate.
Gas stations are calibrated at least once a year and your odometer is tied to your speedometer, I'd trust those over the onboard computer any day. Unless of course you've changed tire diameter which would throw off the speedo/odo.
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Usually off by 2 mpg or so due to idle time. Whole reason I use Fuelly.
I was averaging 28-29 stock, then dropped a few with 18x9.5 wheels and larger tires. Tuned as well.