w00t! jack nailed it man. If you're sniveling about gas mileage you got the wrong car. Sorry dude but the fact of the matter is, horsepower production is a function of how much gas you can burn. The more dinosaurs you burn the more power you can make. You bought a car with a stout appetite under a heavy right foot.
Anyway, since you have an auto, get the 4.10's and learn to use cruise control. Your engine can manage itself better than you can on the longer runs. I use mine in town but, I'm that way. You should probably be able to consistenly make 22-24mpg highway (that means cruise control on just chillin highway, not haulin' ass highway) regardless of what gears you get. I see the most difference in town (much lower mileage... bad). highway runs to the other end of california still have me getting gas at the same ol' places. Using less gas pedal to fly up the Grapevine (a big nasty gas eating car overheating low mountain pass in SoCal) in 5th gear saves a good bit of gas regardless of RPM.
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