78 mph)
Well I doubt your were actually getting 25 mpg at a steady 90 mph, but I can't prove it either way, although if you believe it, I suspect you are deluding yourself., which I suppose is a form of insanity (but a common one). I am old enough to have actually driven 1967 vintage cars when they were still relatively new. There was no US manufactured car sold in the US in 1967 that would get 25 mpg at a steady 90 mpg. So I guess I am saying you are insane, or at least that you are making insane claims.
When you are driving in town mileage drops drastically because you are constantly changing speed. It takes significantly more energy for a given distance to accelerate a car to 45 mph than to maintain 45 mph for that same distance. If you actually drove a steady 45 mph for miles and miles, your mileage would be very good. But, how often do you actually drive for miles and miles at speeds lower than 55, 60, or 65?
And of course there is the whole problem of how to accurately measure your vehicle's mileage at various steady state speeds. Certainly you did not have this ability in a stock 1967 Camaro.
You may not be insane, but you just may have insane ideas....
Ed
