i dont think that just adding the 2 ounces will increase your gas mileage by increasing the amount of fuel in your tank.

from what i can see here it seems that the reason for the gas mileage gain is the increase in power and the better running engine. the more power and the better running your engine is, the less you need to press on the gas pedal. the less you press on the gas pedal the better mileage you get.



$0.02