hartinclay

iTrader: (1)

4.8 spun a rod bearing so time for a new engine. Im wanting to go with a 6.0 or at the very least a 5.3, but Im still looking to get halfway decent fuel economy. Truck is a regular cab 2 wheel drive. It already has a built 4l60e, longtube headers and a decent tune. Ill keep the 4l60 trans for sure. By swapping to a 6.0 lq4 or lq9 will I really see a detrimental decrease in fuel economy. I drive mostly highway and dont flog on it except for when I go to the track. Right now its averaging about 17-18 on the highway. I was wanting to do a 6.0 with a mild cam(texas speed 224) and I also have a tbss intake sitting in the garage at the house. Ive searched a lot and found inconclusive evidence. Just want some decent opinions from those who have done it.

jiar577

iTrader: (2)

Mileage should be really close as long as you control your right foot. Do it.

01WS6/tamu

iTrader: (36)

Big motor light trucks loafing along. We did a 6.0 swap on my dads 01 RCSB 4x4 when it had a couple thousand miles on it 13 years ago still have the truck runs waaaay better than doggy *** 5.3 and gas mileage actually got a touch better because it's not laboring to move the truck

jiar577

iTrader: (2)

[QUOTE=01WS6/tamu;5219030]Big motor light trucks loafing along. We did a 6.0 swap on my dads 01 RCSB 4x4 when it had a couple thousand miles on it 13 years ago still have the truck runs waaaay better than doggy *** 5.3 and gas mileage actually got a touch better because it's not laboring to move the truck[/QUOTE

Lots of people report the same results when doing a 6.0 swap, it's all over the forums. Try a search.

hartinclay

iTrader: (1)

I have done a lot of searching and its almost split 50/50. Seems like half say that its not a detrimental loss and half say its a gas guzzler. I kinda figured it wouldnt be that bad with my lighter 4l60e, 3.42 gears, 30 inch tire, and 2 wheel drive. Especially being a single cab

brewster240

I have a Lq4 bottom end, 243 heads, ls2 cam, long tubes, and cheap intake.

Mileage is about the same as my stock 4.8

Seems a little better around town and a little worse highway

726.0chevelle

iTrader: (17)

Fuel mileage will be affected more by gear, converter size and cam size. My lq4 with a comp 265 has seen 17 plus highway driving. And that's a extended cab with 20 inch rims.

SnakeOiler

iTrader: (6)

My 5.3 got 22 highway, the 6.0 gets 19 highway

01WS6/tamu

iTrader: (36)

Right foots biggest factor.

Blackpanther99

iTrader: (8)

This^ and mods.