I found im getting better gas miliage with my 3.90's. And on the highway also. Im not on the highway a lot, but now im in 4th and 5th gear sooner and not lugging around. You might drop 1-2mpg on the highway, but then you'll probably make it up in city. I go by how far i get out of a tank of gas, and im going further now.
Your motor will be reving higher, but it will be less work for the motor with the easier time on it with the lower gears.
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1997GT SOHC, PI Heads,intake, SCT 4 bank, UPR CAI
Zex Nitrous system 125 hp shot,Steeda Tri-AX
March Underdrive pullies,2 1/2 O/R Pipe, Magnaflow Catbacks,Mac Upper and lower Control arms,5 speed
4.10 Gears,31 spline, Nitto 555 drag radials Spinning
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