06 Commander 4.7L V8: Fuel Mileage

[Sal-XK]

You have to be careful running that amount of tire pressure the 80PSI is the max based on having the max load as well. Just keep an eye on uneven tire wear you run the risk of wearing out the center of the tire faster then the sides with to much air and the opposite with not enough. Doc recommended drawing chalk on the ground and running it over then you can tell how much of your tire has contact with ground.

[jcoulter]

Chalk, hmm? Hadn't heard that one. I'll have to grab the kids sidewalk chalk. My buddy once told me about using flour but I never did that cause of the mess it would make.

[strokeZ]

33's w a RR lift? That's pretty good. Did you remove the fender liners?

Just use caution running with that much pressure. I aired up my 265's when I had them to 35 psi and found the XK to be skiddish over bumps - especially bumps on curves. 30 seemed to be the sweet spot. On my 285's I am running 35 and it seems to be civil on the street.

[Sal-XK]

Chalk, hmm? Hadn't heard that one. I'll have to grab the kids sidewalk chalk. My buddy once told me about using flour but I never did that cause of the mess it would make.

Ya just draw really thick patch with your kids sidewalk chalk and drive over it. That was Doc's suggestion I never got around to trying it yet. We had this PSI=MPG discussion before. I settled around 40PSI for my needs.