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Well, uh... Mathematically 3.55s would give you a 21.6% boost in torque compared to 2.92s... (3.55/2.92)
Gas mileage I'm not sure. That's a bit of a guessing game.
All due respect, I'm going to make this as simple as possible. Basically, the gear ratio is how many times the drive shaft rotates compared to how many times the axles rotate. So with 2.92s the axles rotate 2.92 times before the driveshaft rotates once.
As for cruising RPM, take your current cruising RPM at any given speed and multiply it by the torque multiplication of the gears over stock (so 1.216, or 1 + [3.55/2.92]). So what a speed once was at 2000 rpm is now at 2431 rpm.
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