The carb, timing, & vacuum advance all need to work good to get the best MPG. The only way to increase it if you are doing highway driving is a higher gear ratio. The engine is just turning too fast with the 3.90 gears to get respectable mileage.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne Super In the Gallery Forum
