I just bought a 2006 chevy crew cab 5.3 with 3.73 and a G80. The truck is on 20" rims and 275 60 r20's. the truck gets horrible gas mileage, I need help getting better mileage and mabe making the truck respond a little better. I was thinking long tube headers off road y, CAI, and a good tune? Im sure I need smaller tires as well but not sure what to go with.

 

what kind of gas milage you gettin now?

 

Tune!

 

+1 for a good tune! Went from 12/16 to 14/20 from a tune, feels like I picked up 20hp as well

 

i got 6.4mpg in town last tank. damn 4.10 gears and winter gas...

 

wow. I hope you're making north of 700hp. that sucks dude, at least gas isn't still $3.xx

 

maybe someday. i just got it about a month ago. it has 180k miles and i think she needs some tlc this spring when i can drive my car around again. planning on doing the topend rockers/springs/etc.

 

Smaller tires, thats alot of extra weight, what rims are they? are you stock height?

 

depending if you do a lot of driving, 4.10s will really help your gas mileage and pep.

 

with that kind of mileage, I would have to say there is something else wrong.
check your plugs, and snag a good tune.