I just a set of 3.73 richmond gear sets but i am debating now if it is too much for the street on my car. will it really crunch my gas mileage. this car is my daily driver and i am currently running a zz383 with accel superram and a 4 speed automatic with 2.73 gears. the 2.73 gears are ok but i really dont need a huge top end speed. with the 2.73s i got up to 145 at 3000rpms and my redline is 6000rpms.