sorry man but if you want power and good gas mileage, get a LS based car.
an EC is only going to get worse.

 

i get 12 street 19 fwy...

 

What the hell? How does anybody expect 20 city in a truck??? The most efficient 1/2-tons right now are rated at 20-22 on the highway; why would even think for a minute that any less than that in the city is bad? I average 11.8 in the city, 14.5 on the highway, and I drive a 6.2 6-speed 3.73 truck leveled on 33s. I'm not impressed with my mpgs, but I'm not getting bent out of shape about them either.

 

LS3 swap it and be done with it. Lol

 

Well I guess that's it then. This is one project that just doesnt fit into my life at the moment. I would like to thank everyone for thier responses. I think im gonna trade my 4x4 ranger for a 2 wheel drive 4 Banger or something. The thing is, I have to daily drive my truck as my mustang gets horrible gas mileage, I refuse to buy a third car and can't get rid of my truck as I have dirtbikes. 4 Banger ranger or Tacoma here I come.

Thanks again for all the responses.

 

I get 9/12 city/highway

 

I feel much better about my crappy gas mileage now.....

 

Ok what about this lol

A 2003 2wd 5.3 is rated at 15/19

What if i did only the following mods?:

k&n intake
ported throttle body
long tubes
high flow cats
2.5 inch piping
magnaflow muffler
tune

Think this setup will be able to retain the stock 15/19 or maybe bump it by 1 MPG?

Also how do I know which ones come with the 3.08's or 342's?

 

Do what you want... we've told you our opinions.

 

the lack of a manual transmission behind a 5.3 is what kills the mileage capability of these trucks.