If all you guys get better MPG with lower gear ratios and bigger cubes how come we don't get 50mpg when we run 540 inch strokers with huge cams and 4.56 gears? Look at some big rig trucks, some of them get 5mpg weighing 50,000 lbs and aeodynamics worse than an imperial yet compareatively they have very tiny engines and they turn very low RPM going down the road. Mabey it is just because they are diesel? OK then how come my moms huge luxury maxyvan with everything under the sun inside weighed over 6000 lbs with terrible aero but still got 18mpg? Oh yeah it had a very small engine turning very low RPM, 225 slant six with 2.94 gears and very tall tires. You only need X amount of tq to maintain your speed going down the road, if your engine is produceing any more it is wasteing fuel. Most cars need less than 50hp to keep them going 70mph, if your engine can not do that at part throttle at 1500 or so RPM something is wrong with your engine. You may indeed need more power to go up a hill but that is why we have transmissions with multiple speeds, just let it shift.
BTW for cam selection I think a turbo and an MPG car need similar cams, very little to no overlap, not too big of duration and decent amount of lift.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
