Your Sprinter doesn't even know how fast it's going.
You'd think that with the amount of computers this van has in it, it would have the computing power to calculate the speed with more accuracy. Let's see if I remember all of them. Engine, transmission, instrument cluster, abs, climate control, SKREEM, even the shifter has its own computer. I am sure I am missing a couple.
But, back to the mpg subject, I cant figure out why it is so difficult to calculate the mpg accurately. Like you pointed out, the ecm, based on different sensors and conditions, injects a pretty accurate amount of fuel. Even the scangauge can't do it. You have to play with the calibration on it for a few tankfulls to make it more accurate. I know I am missing something.
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