[sb69chevy]

I have a 350ci and a powerglide, and I drive this on the highway on a daily basis. What would be the best rear gear to run w/ this setup that would give the best mpg, etc. My speedometer is fast...@ 70 I'm really running around 62-65 and turning approx 3000 rpm. I avg around 12-13 mpg as it is right now. I know it may not get better w/ the 2 spd, but just thought I'd run it by the experts. Thanks.

sb