Another New commander Member :)

[Sal-XK]

Welcome to the forum! Sweet looking XK. Lower valance? If your talking about the the plastic air dam\splitter on the bottom of the front bumper that will easily cost you 1MPG just so you know. Getting 10MPG is kinda low for a stock XK. These things are awesome but really like their maintenance a lot. I just bought my second XK not that long ago and the first thing I did was replace all the fluids (went from 10 to 13MPG) it will help. As soon as it warms up its getting all new plugs, PCV, water pump, and front hubs which should get me a couple more MPG's. Also look into the OME LIFT.

[Matt]

Welcome aboard!

How many miles on it? Do you have maintenance records?

I'd put money that you're overdue for spark plugs, PCV valve, differential and transfer case fluids. Throw the gamut at it and your MPG should go we up. I get 12.5-13 city (lots of traffic lights on my commute) and I'm running much larger tires and a bunch of extra weight. I sometimes squeeze out 15 on the high.... bricks don't like going fast

[Synthetic Advantage]

Welcome!

Let the mods begin.