I don't drive mine much and when I do, I get 10 city. I can get 14ish on highway, I noticed a big difference when I put the bigger tires on.
I don't drive mine much and when I do, I get 10 city. I can get 14ish on highway, I noticed a big difference when I put the bigger tires on.
4.7 with QDII, rocky mountain edition
I have recently noticed a significant change in my mpg with a change in air pressure. After my lift, at the installers recommendation, I was running 40psi. Per the in dash computer (not accurate because I haven't reset it for the larger tires, but useful for comparison purposes) at 40psi I was getting 10-12mpg. I tried upping that to 45 psi and found that my mpg went up to 12-13mpg. For my last trip I went up to 50 psi and got 15-16 mpg. By this theory, I am hoping that at the max psi for the tires (80psi), the car will actually make gas while driving, but I am thinking 50psi is going to be the sweet spot and don't anticipate any further improvements.
The best things in life can not be found on a map; they can only be found while Wandering.
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2007 XK - 4.7L Flex Fuel // Rocky Road 2.25 lift // Rocky Road Super Sliders // Toyo Open Country 265/70R17 tires // 4xGuard Front Guard // 4xGuard Belly Guard // 4xGuard Matrix-HC with optional front hitch // Warn XD9000I hitch mounted winch // Graco Carseat for the Youngun
http://www.xk-forum.com/blog.php - The Wild(life) Side of Jeeping
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.
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.
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.
2012 Jeep JKU Rubicon - 4-1/2" AEV lift w 35" Toyo's
03 BMW Z4 2.5i ESS Stage 2 Supercharged, Custom Suspension, Stebro Exhaust, Hamann Side Skirts
85 BMW 535is Lowering springs, bilstein sport shocks, extra attitude
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