Laughing out loud at that one. Why YES, I did eclipse 6 mpg sometimes. I got 10/12 on the highway, 8 in town sometimes, and about 6mpg at the track. A tank of gas was good to about 120 miles, but I never risked it and stopped at most every gas station I could find while on club cruises.
950 Quickfuel, New style Super Cobra Jet heads, stock SPF headers with stock sidepipes serviced to remove a lot of the baffling.
Damn thing was smelly, loud, and so fast. I would do it again in a minute.