Quote:
Originally Posted by bnmccoy
I was very surprised that the indicated MPG was so far off from the actual MPG when I filled it up; and I was disappointed to say the least.
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Unless you put in exactly the same amount of fuel as when you started, you will always be off from the dash computer. I know people say that their hand calculations are more accurate, but unless you have a visible calibration line set on your fuel tank to prove that you always start with the same amount of fuel, I'd expect my numbers to be different from what I pumped into the tank and what the dash computer is telling me. On a 300 mile trip, with the dash indicating 10 MPG which should be 30 gallons, a one gallon difference in what you actually pump into the tank and your hand calculated mileage could be as high as 10.3 (pumping 29 gallons) and as low as 9.7 (pumping 31 gallons).
Since the tank is opaque, it's impossible to tell after you fill-up, you have exactly the same amount of fuel as your last fill.
