I am trying to check the gas mileage on the 66/289 4v. I filled it up the other day and parked it. Well, 15 yr old decided to crank 'er up and man, he doesn't know what anything under 3000-4000rpm's is! I mean everytime he gets in it, it's vroooom! I told him he is not to touch this until I can check the stupid mileage. I mean, it's 40 miles to where I work and I would like to see what it does. Yes, I do get down on it some, but not constantly. He is "constantly" on it, when I let him drive it (which is very often). Whew, does anybody else have this "offspring" problem... I told my wife, that's what we get for having sex!Teenager!!! LOL Btw, I did check it and got 14.5 including all the vrrrooooming. Will try again... :: I really pity the 350 cheby we put together for his '56 pickup, when we finish that thing...look out!