If you have the auto with 3.73, you'll be running at around 2K RPM at 70 (1834ish) a little lower at the standard 3.21.
You can just fill out the charts here and see. (I ain't good with maths)
Gear Ratio Calculator
If you drive around town quite a bit, your city MPG may suffer. Same if you're running a wider tire. (That's probably the biggest drain going from a pizza cutter 32 to a 12.5 -33")