GFF is pushing over 1000hp and can tune his to get 24mpg. Also that dully pulls his monster 40' trailer getting 20. If only I could get a diesel Hilux.Yup, the 3500 is reported ~19 mpg avg and goes up from there if you do a delete or have a tuner set for MPG. It's insane to think that a 8K+ lb truck with 370 HP and 800 lb*ft can pull better MPGs than my 5K lb Tacoma with 240 HP/270 lb*ft.