Your exhaust plays a role. I got quieter mufflers on it late this fall and was surprised to see the tach at 4,500 on the freeway cause it wasn't too loud at all. I was like I didn't know I was going so quick.
Since you drive the car only 30 miles max one way--but could that not change? Well if it is just 30 miles or less and your going to change the 3.23, I would go with 3.91's or 4.10's
60 mph isn't nothing, my 340 with 27 inch tires and 3.91's pull well past 100 mph to its safe 6,500 red line I set--got a rev limiter to stop me, lol
i would first drive with the 3.23's and see how it is first cause traffic moves so fast in some places. Took the 08 Saturn on a long road trip and got just 20 mpg cause I was going a little quicker then most--but did still get past a few times. Was going 80 to 90 most the way, seen not one car pulled over and just one cop car going the other way, he was flying also, lol, I think I was at 80 before tapping the brake and said oh no but he just whizzed on by .......but then other parts of the state its cops everywhere stopping cars going 76 in a 70 zone..you got to remember where you are at.
