So I've had the VX for two months now and it's averaging about 13.5 MPG combined town and highway (no off road miles...yet) over the course of 850 miles.

Not really happy with that, but if that's what it is, then that's what it is.

Any thoughts about making some improvements? (I've read lots of the existing threads, but did not find what I was looking for)

It has a green air filter and I'm running 275/65R18 at 36 PSI. It has 70K on the odometer.

Thanks for the help.