Great work Dmerc. I've always had a feeling Tquads had potential. That cam is probably helping too. Does it run clean under 2000rpm?

Can't wait to see your before and after vacuum advance numbers too.

Is your comp ratio 10.5 or 8.5 to 1.

I've cracked 20 also. My 87 Ram, reg cab, shortbox has a 5.9 Magnum, 670 Holley, M1 dual plane, short headers. Then a 5 spd manual w 0.73 od and 3.55 gear and a 28" tire. Straight highway at just under 70 mph has returned 23 mpg. I'm pretty sure aero dynamics is my biggest roadblock in the quest for mileage.