this is the reason i'm running taller gears than most recommend in my dd.. i cruise between 80-90 regularly on the 405 and the high rpms were just too much for my liking with how i was geared for 33's. switched to 35's and kept the same gears and it's money on the highway. few extra shifts here and there don't bother me city driving and being in 4th gear at city cruising speeds is fun, not gonna lie.
too bad they don't make 4.72 gears, they would be perfect
Don't get me wrong, I like low gears. I just know 5.13 with the 6 speed would be a tad bit much. Only by a small amount.