Hey lizard, I have my shoes on right now so can't do the math. But I have 285's too and it is a increase of 6%. So, what ever 6% is of 225 added is still crap,... but, ....well,.... I guess we didn't buy our beloved VX's for the MPG. Of course I CAN SAY THAT since my commute is 6 miles one way to work. If we go anywhere, we take 'she who must be obayed' new Suzuki Grand Vitara. Totally boring but I didn't buy it or drive it, I just wash it, put on very dark sunglasses and read a book while she drives.