04 Rio Cinco:2 Mileage Questions

1. Fill up your gas tank and record the odometer reading.
2. Drive your car.
3. Next time you get gas, fill up the tank. Record your odometer reading and amount of fuel necessary to refill the tank.
4. Divide the difference between the odometer readings (miles driven) by the # of gallons at the fueling in step 3 (amount of fuel used). This will be your miles per gallon.

This what I have been doing, but getting some weird variations in my calculations. I am guessing to get more consistent (accurate) numbers I should just stop filling when the pump shuts off rather than "topping off".

I drive about 90% highway miles @75 mph, and am only averaging @25-28 mpg, seem pretty low for such a small engine.

P_

You shouldn't top off after the automatic cut off. This can get fuel in your canister and other places it shouldn't be. Just stop when the pump cuts off. Keep in mind that you will have some variation. The last time I checked fuel mileage on my car, it varied between 18 and 23 mpg regularly.