Quote:
Originally Posted by 99metro
My truck seems to get the best fuel mileage (29+) during the first 200 miles, then drops off after that (21 to 22 for the tank). Scatchin' my head on that one. I fill til nothing more fits in the filler neck.
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Are you getting your FE from the lie-o-meter or from a scangauge. I don't know but I think the lie-o-meter actually uses the fuel gauge at least partially in it's mpg calculation. If you fill up all the way your tank level won't be changing in the first 100-200 mi (according to the fuel gauge) a la better mileage. That being said, I pay close attention to mine, but haven't observed anything as dramatic as what you're describing.