LQ4/LQ9 4l60 Gas Mileage, 72 4x4 k5

[themb2g]

This is a question for anyone who has converted to an lq4 or lq9 or any ls for that matter. I am trying to find out about what gas mileage i could expect from installing these in a 72 4x4 k5. does anyone out there who has already done this know about what to expect on average? with gas prices going up, i am not sure if I want to do the LQ4 or go to an LM7. Thanks all.

[Cap'n Hook]

Haven't done it, but would like too. If you're looking for gas mileage, then I'd go with the 5.3L as that's what I have in my '05 sub, and I can get as high as 21 mpg on the highway with a light foot. I don't think you'll ever see a 6.0L get that unless it's in a Vette!

[hgs_notes]

We have the 6.0 in my wifes Yukon XL denali and it will get 18-20 on the hwy without much headwind or with a tail wind and about 16 into a wind. That is in a 6000 lb truck with awd. I would think loosing 2000 lbs would vastly improve the mileage.

[OldCreek]

My LQ9 in '71 K5 with 4"lift, 35" MTs, 4L60e, 4.10 gears, no top and a medium foot gets about 10.5mpg overall. Local with some highway driving. That was 1-2 months after the rebuild...I haven't checked it lately but I doubt it's changed much.

It's too easy to get on the gas because it moves and sounds good!