azsundevil

That's about what my DIC indicates but when I actually fill up and hand-calculate, it turns into roughly 18mpg. Try doing the calculation yourself and see if it still adds up. Seems like some of us have trucks that don't accurately measure fuel consumption.

Yep, that's spot-on for me with my 4.3L. I think a lot of people who brag about high MPG are being a little dishonest with themselves and maybe not telling the whole story. When I calculate my MPG by hand, I usually get around 18 if I've been driving economically, and I've seen as low as 14-15 if I've been driving REALLY aggressively (I live in Socal, our freeways are a free-for-all deathmatch). Yeah same here, the computer is waaay off on mine. And I'm running stock tires with no lift. Computer is off by as much as 3-4 mpg sometimes.