Is it true you "adjust" a car to get much better gas mileage? [View All]

[TheFarseer]

I heard that the factory can set something different so that a car will get double or more the gas mileage it does now. I don't have a news source or anything, but a friend of a friend said they had a Cadillac that got over 60 mile per gallon. It was just a normal big-boat Caddy that you would have thought low 20s for gas mileage. Someone that might know told him that the factory screwed up and didn't set something right and that was responsible for the superb gas mileage. Of course this is second hand info. Can anyone tell me anything about this??