Okay, I just ran through a tank of gas(all stop and go, short distance, some long idles, and just plain ole getting into the throttle) since installing the cam, converter, and headers. And tuned of course. The computer said 9 mpg, but I did not write the numbers down to compare with a hand calculation. I'll do that on this new tank of gas and post up the results.
However, the last time(many miles ago) I did several comparisons, the hand calculations always seemed better than what the reading gave from the computer. Usually, 1-3 mpg better. Anybody know why?