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a cam of that size doesn't kill your mileage much, what does do the damage is the converter size 3k and up. If you're going for a TB stall it wont kill your mileage that much either. now keep in mind what also determines your mpg is your tune, making sure air/fuel ratio is where it's supposed to be and stuff like that, so make sure you a get a good tuner... there's a couple guys here on pt.net that do mail-in tunes and do a pretty damn good job at it.
__________________ 1987 Chevy Blazer K5
6" Rough Country suspension lift
Bone stock 350 tbi
I lost about 1-2 mpg with my cam. It's considered a baby cam for a 6.0 though.
I average about 8 in the city and anywhere from 12-15 on the highway depending on how hilly or flat it is. The 4l80e seemed to hurt the gas mileage more than anything though.
dropped ECSB, H/C 6.0, KB S475, Jake's 4l80e, Circle D 32-3400, 4.10s, Moser 5 lug swap, 315/60 MT ET streets on Racestars.
542 rwhp @ 8 psi. 1/4 mile times on 17 psi coming... Budhayes, gone but not forgotten.