What kind of transmission?

[mcmullinauctions]

So I know I have asked questions about the t5 in the past but...What kind of 4 or 5 speed manual is the easiest (no hassle) swap for gas mileage with a 3:73 or 3:08 rear? I will have a 350 up front but would like to look to stay with a stick. I don't plan on doing very much if any hauling or towing at all. I want to try to get 18-20 mpg somehow, that way I can replace me 05 GMC with it as a daily driver. Nothing would be better than to see your insurance agent drive up to your house in a 63' chevy.