Cheapest Upgrades for better mileage

[Centerfire]

I do not believe their is any upgrade that will give you a return on your mileage investment. If gas averages $1.50 @ gallon. If you presently average 10.3 (which I do), and increase mileage 2 mpg.( which I do not see happening) You are saving apprx 2 - 2.5 cents per mile. so for a $250.00 system you will have to drive 10,000 to 12500+ miles to break even.
Just put the gas in and drive like hell and stop looking at the mpg gauge, it will only make you crazy.

Mike