I'll let you know how it goes. I've got 265's now, but I'm throwing on 285's and some pretty heavy steel wheels tomorrow. My baseline on a stock '99 4dr 4x4 is about 14.7MPG with mixed use driving. I'm usually toting around an 8 month old, so I have a pretty light foot. How you drive has an awful lot to do with how many MPG's you're getting. I'll post the results as soon as I burn through another tank.