what mods improve gas mpg

which mod (if any) would improve gas mileage (mpg)?

I can't think of any. Besides paying for a mod that'll save 4 cents per gas bill doesn't make economical sense.

And whatever you do don't buy those "tornadoes" or "spiralmax" parts, they don't work at all.

I remember reading somewhere that certain ecu chips for certain cars will end up improving gas efficiency somehow. I also would like to know from people who put the hondata chip or headers, or exhaust, cams, or whatever, how the gas mileage was affected.

I definately was not talking about those bullshit informercial gadgets that "magically" do this or that :nono:

AEM intake system............

Do a Geo Metro conversion. It'll cost a bit and you'll end up with a lame-ass ride, but you'll save money on gas... :biggrin:

Nah, the Metro conversion will be too slow for an RSX. You'd need at least a Metro with an electrical assist. Why not a Civic Hybrid conversion?

I don't know about the AEM intake. I didn't seem to get better gas mileage after installing it. It didn't go down either. So more HP with same gas mileage = :bananasmi :bananasmi :bananasmi :bananasmi

Most mods if used for what they are planned to be used for account for less gas mileage.

Yup