OK, so here is the deal. I knew my car was not getting any decent mileage numbers, so when I left my college apartment today to head back to my parents for the long weekend, I topped off the tank.
I drove exactly 80 miles (all highway) running 65-70mph the entire time. I babied it the whole way, never over 3k rpm. My cruising rpm was between 2300-2600 rpm. I pulled into a station and filled up and the car took 6.7 gallons. So as the math indicateds, 11.94 mpg! Ouch
Here are the engine specs:
Engine:
Carb: Holley HP 750
60 over 350, squared, line honed and torque plate honed Keith Black hypereutectic pistons. Speed pro rings. 6" Elgin 5140 rods with ARP bolts. Internaly balanced, clevite bearings, ARP bolts used throughout engine, Dart Pro 1 200cc heads, cast crank, crane cam 228@.05 480 lift. 140 amp alternator, weiand water pump, AZC radiator and taurus two speed fan.
Now I know carb'd v8's aren't known for amazing mileage numbers, but I feel like I should be atleast getting 16 or so. I PM'd grumpy the engine specs and he felt like 18-20 mpg was acheivable.
Trans is a t56.
The fuel pump is a Holley Red and I am not sure if it is the 67 or 91 gph, but I glanced under the car and I didn't see a fuel return line. Could that be the problem?