18.4 mpg!!!

thats awesome!!! i took an all-nighter road trip, 550 miles, when i had my 7.25 sure grip with 2.94's and 185-35-13's and got 18.4 as well. recently, after my suspension swap, with an 8.25 with 3.55's and 225-60-r15's i pulled 20.3 on a 600 mile round trip. both times were doing around 60 mph. i run a 318 highway patrol engine (87 vintage) topped with a 650 spread bore holley, backed with a lockup TF999.