|
If you don't mind it being a bit slower in acceleration change the rear end gears as already suggested.
Back in the 70's my dad had a 1968 Ford pickup with a 352 V8 and a 3 speed manual transmission. It was awful on gas. He swapped out the 352 in favour of a 240 I6 and the mileage became incredible. The rear end was obviously intended for the V8. It became more difficult to get the truck moving if it was loaded but it would really cruise on the highway and was doing in the mid 20's on mileage. It wouldn't have been everyone's cup of tea as it was a bit lazy in the acceleration department but the mileage improvement was unreal.
__________________
1968 Chevy - 292 with a powerglide
|