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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Back in high school when i worked at a gas station our pumps were calibrated to 15deg C (59F). Due to this you actually get more fuel under 15 (the fuel has a higher density/gallon) and less fuel if its over 15 deg out (lower density/gallon). I don't know if this is enough to explain the discrepancy but its a theory.