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Re: Mpg
1980 C10. Basically no options. No AC, no radio, no insulation, thin layer of outdoor carpeting, no dash pad. I weigh about 260lbs. Haven't weighed the truck.
flip kit rear, 2.5" drop spindles in the front, worn out stock springs
275/60/17 rear tire (cheap SUV tire)
235/60/17 front tire (cheap SUV tire)
Stock 2006 L59 (5.3L,) dual 2.5" exhaust (mostly, one side the "tail pipe" section is made with some 2.25" piping because its what I had on hand and wanted it done... need to fix it) with 28" Glasspacks, no cross over, turned out before the rear wheels. Stock 2006 Yukon air intake tract/filter housing/etc.
2005 4L80E out of a van. PCM adjusted for the rear tire size/transmission
Stock open 2.76 12 bolt rear.
Currently running semi rich, fuel trims in the -10% range.
Best I've done was 25mpg at 70mph on relatively flat interstate (Maine, so lots of hills, but no mountains)
Normally I get around 19-20mpg around town, with a mix of short interstate and city driving (again, Maine, so "city".) 18 if I get feisty through a tank of fuel.
Runs 74mph through the 1/8. ET is almost irrelevant because the tire was spinning the entire way.
My truck was my daily driver all summer long, so feel free to ask any questions. I'd still be driving it, but need to register it. Its currently my most reliable/leak free/best fuel economy vehicle, in a fleet that includes a Honda Accord. Trans/Rear gear/rear tire size is all wrong - wants to cruise at 50 or 70, not in between, and 1st gear gets me past 60mph at WOT.
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