correct. and this is a mental mistake that about a million people make when they say... i put bigger tires on my truck and it killed my gas mileage. they forget to compensate for under-registering of speedo and odometer. your size change is fairly small. a change from stock 225/75/16 (29.28") to 285/75/16 (32.83) is about 12% difference on the speedo/odo. 53 vs 60 mph and a couple of mpg.

 

You must be talking about 4x's?

 

Yeh - I think 225's were oem on 2wd and 245's were stock on 4wd.