Ok first of all gas mileage really isn't an issue. Since i have 2 jobs i hardly ever go back home. Which is 2 hours away. More than likey i will go back home not ever once a month. 99% of the miles will be intown. My plans for this car is to make it really fast. like 11 or 12 fast. So should i do with 3.73, 3.90, or 4.10s?