Looking at replacing my faithfull old '98 (A/C is shot along with third gear syncros). Found a really nice 2001 that suit me perfect except for the 4.10's. Personally I don't have any experience with this arrangement. My old man's 2001 auto has 3.54's and pull's great, not to mentions cruising calmly at 75. A couple questions

1. Are 4.10 gears in a auto good or bad (mainly highway driving empty)
2. What kinda milage to expect?

Thanks