[comptiger5000]

I'm sorry, but 33hp per 1000 pounds isn't necessarily enough. To achieve this AND gain efficiency, this would mean my 4000 pound Jeep would have a 2.5 or 3 liter engine. In other words, it would have way too little torque, and would be a nightmare to drive. The 4.0l 6 cylinder (195hp / 230 tq) is underpowered in these things on the highway. Around town, the power isn't a big deal. However, at 60, it has to downshift, so it's no longer turning 1800 rpm, but screaming 2800, to maintain speed on a hill. However, my 5.9L V8 (245hp, 345 tq) with the same gearing has no trouble churning up that hill (and even gaining speed if desired) at 1800 rpm in OD with the TC locked. I've pulled hills around town at 1100 rpm at 37-38 mph in OD with the TC locked. My instant mpg reads about 9-10 doing this. With the smaller engine (4.0), it reads about 8 instant mpg turning 2000 rpm in 3rd (TC unlocked unless you manually lock out OD, then it locks in 3rd) on those hills around town.