depends on truck configuration, bolt-ons, tune, where you live, the gas you use, how you drive, and one or two other things...
mine's a stock 150kmi '01 LM7 with catless LTs, no EGR, Blackbear tune running 87, and CAI. it's a 4x4 RCSB with 33"s that weigh 80lb with the wheel. truck's about 4700lb without me. where i live, the DA's about 3500'-4000' & we regularly have 30-50mph wind. i rarely get on it hard and keep it to 60-65 on the highway. my mixed driving average is usually 13-14mpg. back in FL @ sea level tuned for 93 and running 31" 4-ply tires that were each 20lb lighter, i could see 17-18mpg mixed driving up to 70mph.
long story short - expect mid teens
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