a fairey or an h55 will probably get you to 17-18 mpg .....any one tried a 6 speed getrag? still nowhere near as efficient as a diesel's 23-35 mpg.....have had experience with a dodge turbo 2500 and it gets around 20 mpg normal driving around town..long trips at 60 mph around 23 mpg in 6th gear 3/4 ton pickup.
Lou
Lou