Quote Originally Posted by l.groves View Post
OK. Thats it! I'm getting a new ring and pinion set. Yes I know I will need two sets but mine is only 2wd unless put into 4wd manually. I get 15-17 mpg city. I'm thinking down to 3.20's any suggestions?
Quote Originally Posted by Riff Raff View Post
Thanx PK, you're right on target. The main problem is the tires-- you're running 255/55R18 (29" O.D.) which are smaller in diameter than the OEM tire of 245/60R18 (29.5" O.D.). Thus, your current smaller diameter tires are rotating 1.8% more than OEM causing your VX to consume more fuel (less MPG) for the same distance traveled.
AND...

Unless you're already factoring in 1.8 - 2% less miles on the number of miles driven per tank, you're not getting 15-17 mpg...