are there any kits such as the tbi switch from edlebrock? how much better mileage could you get from it? I don't want to sell my burb because of gas mileage. but the size, turning radius, and the gas might tempt me to sell it when i go to college (downtown austin is a B!@+ch, especially in five o' clock traffic.) i was also planning on vortec heads and other various things.