Ok, so today is the first day every I've driven my '12 JKU on the factory tires and wheels (the cheep steal ones with the tiny tires). The dealer put on my rims and that's how I took it off the lot.
I have a couple of questions and observations. First off, the shake. My 17 inch Moto Metal rims and 285/70/17 Kelly TSR tires were smooth until about 65, 70 mph. Once you hit that speed, it was scary going any faster. Felt like they are totally unbalanced. The stock tire wheel combination allows me to hit 80, 85 smooth as silk. Is there any way I can get the bigger tires and rims to do that? They aren't balanced now with weights, they have the dyanbeads in them. Or is there no way to make them smooth at high speeds because of their size and aggressive tread pattern?
My observation is the gas mileage. Holy smokes. I'm not posting this to brag or anything, I'm simply flabbergasted. I've always gotten good mileage with my jeep. Usually 17.5 to 18.5 suburban/highway driving, and 20.5 to 21.5 highway only ( little to no hills). Now that the stock rim tire set up is on, I'm getting 22.5 to 23.5 mpg suburban/highway driving and 26.6 mpg highway only driving. I drive 55 and never do any sudden starts or stops, try not to pass and try not to down shift. But still, that seems just way to high.
I mean, I know you guys think I'm fooling around. I wouldn't believe it either. Tomorrow I'll take a video of the read out with my ipod and post it.
Do you guys think the mileage could vary from one engine to another that much, or is it mostly due to the fact that I don't go over 55, I don't drive in hilly areas, I don't take off fast, and I now have the small, smooth tires on it?