[COBRAMAN 484]

In the 21 years mine has been on the road. I have used a 428, 454 ( 428 crank ), and 2 different 484s. Compressions were between 9.7 and 11. I've used single quad dual quad and for the last 18 yrs EFI 50mm 8 stack . They all averaged 10mpg. except when I tried a tremec 3550 with a .68 5th, I got 13-14mpg.