My 07 is my DD and that includes alot of highway driving. Mustang Meets cruises, parties etc..etc..and i have 4.10 gears and i probally use up another 2mpg than beforeIMO, I wouldnt go more than 3.90's for a DD especially if you do any highway driving at all. 4.10's if your just running around town and staying local.
My stang is my DD and 3.73's are great. I drive her hard and do a little street racing and they are perfect. Plus my gas milage is still decent and at 3.30 a gallon that has to be cnsidered for a DD.the tires dont just roast? even with the paxton? how much are you putting to the wheels? my big dilema is between the 410s and 373s