so this summer im kicking around the idea of a cross country roadtrip to go see some family. Either need to fly or drive but i'd rather drive my barracuda. For being a 2500 mile trip(one way) I was wondering if it would be smart to swap in some taller gears to improve gas mileage just for the trip, right now i have 3.55's coming off a 318/727 combo. as is im running 3000rpm at 65mph. if i did somthing like 2.93's in the rear it'd cut me down to under 2500rpm's. has anyone tried this? better alternatives?