Just drove the SVT to Myrtle Beach today from New Hampshire with my newly installed 4:10's. I averaged 72mph/2350 rpm and gas mpg averaged 23.1.
I will say these gears allow for not having to down shift very often, at various times I had to slow to 25/30 mph I'd just leave in 6th. Very nice not having to down shift, unless you want to, then hold on with all that low end torque.