Quote:
Originally Posted by FlukeSS
Realistically, the computer is going to know just how much gas went through those cylinders.
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One would expect that the in-car computer would be able to properly calculate the amount of fuel being consumed, and provide accurate MPG, but it doesn't. I don't know why, I don't understand why there literally isn't a single vehicle on the road that has an accurate calc of MPG, and it's honestly frustrating.
My Silverado shows a lifetime MPG of something like 17.5 or so in the dash (I never reset Trip 2). But calculated MPG over 90k+ miles of driving and fill-ups shows the real number to be 16.7. That's about a 5% margin of error which I feel is unacceptable.
I always look at the trip rating when I fill up and compare it to what the calculate amount is. The delta between the two varies all the variance / error percentage doesn't remain the same either. I've had tanks that are very close (maybe a 1% margin) and others that are off by over 10% (truck showed 20 but calculated was under 18, for example).