Originally Posted by snrusnak
I would not ever get 3.21. You'll get the same mpg with 3.21 or 3.55(and honestly probably 3.92 too) as long as you stay at ~75mph and slower. But you're city mpg will improve with numerically higher gearing. I've been experimenting with locking out 6th gear and cruising at 70mph in 5th which is roughly the same final ratio as cruising in 6th with 4.10 gears and I still get 20mpg. But if I go faster than 70mph the mpg drops off.
Well, there's really no cities around where I live. It's mainly all country roads/highways...but we do have some mighty fine hills, haha...so I know I'll probably not go for the 3.92, as I'll probably be exceeding 70 mph (112 km/h) but would rarely go over 75 mph (120 km/h).