I'm a little confused on what final drive actually is after reading the wiki. I totally understand this: Gears: 1st 3.545, 2nd 1.888, 3rd 1.296, 4th 0.972,5th 0.780, So in 5th for every 0.780 revolutions the engine turns the transmission turns once. So it saves on gas provided the load isn't too high. final drive 4.44:1 This I totally don't get. Does a final drive ratio of 3.70:1 get better gas mileage than a final drive of 4.44:1 if driven 100% on the highway? Or something?