I tried searching but couldnt find my answer specifically..I know performance and economy usually dont go hand in hand with trucks but what kind of mileage are you guys running with 408's seeing, Thinking about building one up for my DD. Thanks

 

depends on the setup. high compression and a mild cam with a low stall and numerically low gears will get you pretty good mileage. Wild setup, 4K stall and 5:13 gears, not so much. All depends on you.