the v6 obviously gets better gas mileage the question how far can you go with the upgrades before its not that much better than the 8. I was thinking about putting smaller gears in my rear end but my dad told me that it would decrease my mpg. So dose it decrease them, and if so by how much, is it really worth it? Also ive heard cool air gives you better gas mileage, is that true or a bunch of crap thanks

 

4.10 gears wont effect it that much 1, 2 mpg