ok i dont want to step on toes, but it seems like every other thread i see you saying literally almost the same thing word for word. I realize fuel prices suck, and getting a little better mileage never hurts. buuut if its THAT big of a deal why not but a jetta tdi or something... sure my truck will probably jump to 20 from 17 if i drove 35-40... but seriously... who would do that?? I would buy a scooter if mpg was an issue, and i sure as hell would have my undies in a twist over 17.7 mpg compared to 18.2. Regearing costs money, not everyone has that money or wants to do it. In the end it takes ALOT of driving to actually make up the difference. For instance, 4.10 to 3.55 lets say that gets us from 15 to 16.5 thats 1.5mpg increase now how far do you have to drive to save the $400+ dollars a shop will charge you for parts and labor... its a long ways.

To the OP: Sounds about rightish to me, had 31's and 4.10s in my 77 she was done around 75 and that was a gasser. My dad has an 88 with 3.55s and 235/75s with a C6 and he cruises 75 at 3000, just told me he got 15.2 on his last trip.