Quote:
Originally Posted by jhh3000
you know what's funny, i'm tracking at 29.8 mpg on my car but 27.8 at the pump, over 8000 miles. i keep an excel spreadsheet of each of my fill-ups, and track the total # of gallons going in, and total # of miles driven. can't explain the difference. isn't evaporation, pretty sure i'm not like watering my car with gas... only explanation i have is that maybe the pump i use is faulty? i always use the same pump at the same station.
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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.