i just bought a 1999 chevy 1500 with 5.3 and was wondering how much gain others have seen by putting on electric cooling fans. I'm mainly concerned about the gas mileage gains over anything else.

 

you'll gain the most in this order IMO:
1.) Custom Tune
2.) Efans
3.) Intake
4.) Exhaust

 

about how much gain with each?

 

1-3 tune
1-3 efans
0-1 with intake or exhaust

I get 22 highway with a cammed 5.3L extended cab short bed with all 4 of those mods,headers, and shorter than stock tires.

 

who did your tune? i know a guy in OKC that does ls-based engine tunes.

 

Holler at DozerDan. He did mine. Really good price and even better results.

 

If I gained any mpg with my eFan install it was so small I couldn't measure it. My experience with all my mods, except the stall, has been a gain in performance without a loss in mpg. Still worth doing in my mind.

 

I'm seeing 22 with the tune, and fans.

 

those are performance tunes too correct?
you could always be more conservative with it.

 

not really it's an 89 tune, for a stock motor. It could be better if it was for 93.