waterdog

Ive got a standard cab short bed two wheel drive. Ive only checked highway mileage. with the 5.3 3.42 and stockish wheels just under 22mpg. 6.0 lq9 with a tune, 4.11 gears and 20" wheels, I got 20.8 at 70mph 2150 rpm. figured by hand.

motion427

iTrader: (1)

I have a 4L60 with 3.73's and 275/60/20 in the summer and 285/70/17 in the winter.
70mph give me about 1900RPM.
The cam is a very mild 208/212 w/ .554/.558 lift
258HP with the 5.3L(stock except CAI) and 329HP with the 6.0L(current setup)
I have 4.10's & 4.56's at the shop.Not sure if I should run them or not.

fastnblu

iTrader: (2)

I'd love to hear your results in city. Perhaps u don't do much of that, but if u figure city out, post up please.
I gotta stop seein this, a 6L wasn't in my plans. I don't think.
I guess I won't totally discount it as a thirsty pig. Your 6L HWY is not off much from my 5.3/ 3.42 on 16"s.

dirt track racer 81

iTrader: (45)

Dozerdan has 4.56s in a reg cab and gets 20mpg on the highway. its all driving habits

fastnblu

iTrader: (2)

My right foot, I'd prolly get 17 then. Does he drive like a Grandpa?

waterdog

I drive mine pretty easy. I used the cruise control at 70mph, pretty flat , no hills. In town doesnt seem any different than the 5.3. I think its the weight of the truck, the tune and driving habits that affect it. Everyone thinks 6.0L eat gas but theyre in heavy trucks. My extended cab 4x4 with 4.8L only got 18 highway. Im getting ready to install a radix112, long tube headers and a 212 218 cam. I still think ill get close to 20. The 6.0 swap was easy to do, best bang for the buck.

Phantom

iTrader: (16)

I have a 5.3 though...read the thread title first son

MPFD

iTrader: (5)

3.73, 255/70/16 tire, crusing at 21-2200 rpm.

zachm89

iTrader: (16)

i usually get about 12-14 city and can get anywhere from 17-21 in the SSS on the hwy depending on how fast im running it and how hilly the area is. Thats with 4.10s and AWD

BadAssChevy327

iTrader: (7)

my 2wd SS gets 15.5 before the centerline and shorter tire. i know its better but my mph is off now so i dont know. plus since taken the cats off and the cai i know it needs a tune bad. i drive mostly 55mph roads with mixed traffic, leaving haalf thorttle sometimes. and the long boring ride home at midnight i get on it at least once