I was wondering how much lighter the wallet is going to be after having new gears installed. I am running 32s and want to upgrade to 4.11s from my 3.08s with a posi in the rear. I was also wondering what the damage to my gas mileage would be? I currently get about 8 miles to the gallon city, 11 highway. 85 k5 blazer with an old 305....must have more power!