Slant 6 MPG Upgrades?

I was gonna say something about being "worth it" what you're looking to spend for what you get out of it in return... The more you have to pay to "have" done for you the less worth it this becomes. The more you can do yourself or with the help of a buddy for beer money, sort of thing the more feasible it becomes.

And your statement about lower rpms = more mpg doesn't always hold true either. There comes a point where you are lugging an engine. When I had my wrangler with it's 4.0 inline 6 and 5 speed (all stock) with 3.07 gears and 235/75-15, it didn't like being run in 5th below about 60 unless I was rolling downhill. Which was worse with the 31/10.50-15s I had in it for a while.