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i saw a news report the other day about a guy who took his 87 stang and tweaked the engine to get 38% efficiency (most stock engines get 8-10%). Got the same HP and 0-60 speeds out of it, but at 110mpg!
He did that to an '87? Strange, as cars had computers controlling the fuel/air mixture starting in the early 80s. Maybe he reprogrammed the computer? A lot of people are adding hydrogen gas to their air, in order to more fully burn fuel in the cylinders. Problem is that the computers in modern cars try to adjust for a leaner mixture. Older cars don't have this problem and are increasing their MPG by about 30%.
I can't imagine a Mustang getting 110 MPG and would have to see it to believe it.