99 Regular cab stepside 2wd with teh 5.3 only thing done is a hooker aero chamber muffler and i get anywhere from 13-15 in the city ( i dirve my truck like someone wants to race at every red light) to 19-21 on teh highway and that is doing 75-80 mph.

 

I drive like a grandma most of the time. With a couple of full throttle blasts every tank. It must be the 4.8L

 

Since my new mods its gettin about 15 city.

 

2003 ECSB 4.8

21-22 highway
prob 17-18 city

 

well i put my stock denali rims & shorter tires and the average went up to 10.8 now

 

02 ECSB 4.8L 3.73's 17mpg 85mph+ on the highway

 

me too ..... rcsb 4x4 4.8 got a extang it helps a tad............see 4.8s dont suck



oh i dont drive like a granny just take off easy..........well i do drive like my granny 85 mph

 

I get 19.8 mpg commuting everyday, up and I-95 to Northern VA. On full highway trips (400-800 miles) , it gets around 22mpg. I believe straight city driving nets me 16-17mpg

 

Werd. I wonder about the gas milage # some people are posting up. I drive like an absolute granny, and don't get over 14 mpg city with my truck. EVER.

 

I guess it all depends on what kind of driving you do. I mainly do city driving. But my city is spread out, and I get to cruise at about 35-40 with relatively few stoplights. It definitely is not gigantic city driving, but it aint highway driving either. It might also be that I'm at 5,000 feet, and less air and fuel goes into the engine for a given distance of you sea level boys.