245's or 255's

I now have Revo 2's in 265-70-17. I am looking into getting the Dynapro ATMs in 245 or 255 -75-17. does anyone here have either that they can post some pics and experience with?
I want to go thinner to maybe improve MPG and also help in snow. the 245s are about 8/10 inch narrower and the 255s 4/10 inch smaller. at less than a half inch do you really see a difference when looking at them? also the 245's are nearly same diameter as I have now and 255s 1/2 inch bigger. I have 5100s set at .85 and have no rubbing now, do you think it will be an issue?
thanks in advance for info and pics

oh and I don't do much offroading at all. maybe beach once a year and dirt roads. I occasionally carry weight in the bed but not much, a few hundred pounds. im debating between P and LT rated. price diff is about 100 more for the LT

 

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Im planning on running 255/75/17 in either the cooper at3 or st maxx. I think 255's will look better than 245's.

 

I'm running 255/75/17 atm and love them. They are a great tire. They actually run a little bit bigger than the Cooper at3 in the same size.

 

received my Dynapro ATM's from discount tire direct yesterday for $450. 255/75/17 P rated with black letters. I do 99% on road driving, lots of snow here in CT and my Revo 2's just weren't cutting it. Also have some eibach 1.6" coils on their way, will reset the 5100's to 0 zero and throw new springs and then tires once it warms up here a bit.