Final drive gear

MR.nismo

I was looking around for a replacement of the final drive gear (FDG) on my Z. I have an 2011 6mt and I would like to know if it is possible to replace the final drive gear with the one from a 7at. The 6mt is 3.692 and the 7at is 3.357. I know it will drop the pick up speed, but I don't care about that since I don't do street race or anything like that. I do highway driving alot, and I'm looking at reducing the RPM's therefore saving some gas and not killing the engine.
According to the speed/gear calculator at 3000 rpm's with the 3.692 I'll be doing 82 mph while with the 3.357 I'll be doing 90 mph. Now at 2700 rpm's with the 3.692 I'll do 74 mph while with the 3.357 I'll do 81 mph. I know there are gears out there to do the opposite, to pick up speed quick....but that's not what I want.

just to give you an idea: in 6th gear

................... 3000 rpm vs 2700 rpm

(FDG) 3.692.... 82 mph 74 mph

(FDG) 3.357.... 90 mph 81 mph

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