Top off your tank, note your mileage or set trip meter, drive till you need to refuel then divide your mileage by the gallons you refueled with, that will give you your MPG'S.
If you are trying to find out how many gallons are left when the fuel warning light comes on then do the same thing; top off your tank, then when you refuel deduct the gallons used from 14.5.
The fuel warning light is very inaccurate, I've refueled with anywhere from 12 to 13.5 gallons after it came on.
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