I was where you are, weighing the difference between 3.55 and 3.73 gears - about 6 months ago. Now I had stock 2.73's behind a 5 speed. After the change - its all good, and like someone said - my miles per tank is even or better now. I use fifth gear way more often. Today I was passing a car in light traffic and got to 90mph quick and it was gettin' good, but I let off. The only thing I miss is my car gets to 4800 rshared_pm so quick you don't get to hear the exhaust for very long. To me the exhaust tone is best between 3000 and 4000.

Gears are good.