will i get better fuel mileage with lq4 swap in 1990 pickup

[slowgo]

Found a 04 lq9 intake on craigslist for $50.00, fuel rails, injectors, drive by wire throttle body. Dont think I'm going drive by wire though, thinking that
would be a little more complicated, and i like to be able to work the throttle body by hand when I'm under the hood. Had to drive almost 3 hours to get it though.
But I figured the truck intake would be better for what I want, and save the LS6 intake for the S10 if I ever decide to go EFI.

[beertestr]

Keep the motor as stock as possible, if you can go 4L60E instead of 700R4, and keep the gear ratio reasonable (i.e. keep the 3.42's) and you will do very well. I mention the 60E to try to capitalize on better tunability to TCC lockup and the shift map. I kept my LR4 bone stock and saw 16mpg mixed driving with 285/70-17's. If you keep your foot out of it, the 6.0 won't be much different.... until you put your foot in it and feel the extra 70+ ft# torque.

I built my 94SCLB Z71 with a free 4.8L as a DD, pretty much no "show" just an updated DD. Loved it, I'd still have it if I didn't desire a Crew cab for family hauling. I put 30k miles on it, and the current owner is hauling a 5th wheel (!!) with it.... with a 4.8 and 3.73's.