Tire Size Effect - Discussion/Debate

Hi all, thanks for checking in. I'm at a crossroads in choosing my next set of tires and was hoping I could turn to this forum for some guidance.

I have a supercharged 2014 DCLB Sport averaging roughly 19.5 MPG combined on premium fuel (usually 93 octane). This is a daily driven highway truck (250 miles/week), with some offroad use, and zero ambition for wheeling/crawling/etc. That said I do enjoy the appearance and versatility of an all-terrain tire. I have no imminent need to lift the truck, but do toy with the thought of a 5100/885 setup. All considerations below will mount on factory TRD sport wheels.

I currently have:
265/70R17 | Hankook Dynapro ATM | Load E | 50 lbs/tire

.. and am considering the following:
265/70R17 | Hankook Dynapro AT2 | SL Load | 40 lbs/tire
265/70R17 | Falken Wildpeak A/T3W | SL Load | 46.5 lbs/tire
255/80R17 | Falken Wildpeak A/T3W | E Load | 52.5 lbs/tire

I've had a great experience with my Hankooks, but certainly don't require the E load tire. I'm curious however, if the smaller treadwidth of the 255/80R17 Wildpeak could mitigate the adverse effect of additional rotational mass when considering fuel economy. I'd love the aesthetic of a 33" tire, but don't want to bury myself with fuel costs any further.

Of the options listed above, which do you think would have the greatest effect on fuel economy and ride comfort - positively or negatively? I'm open to other considerations as well. I understand these trucks were not made for MPG's, but this is the situation I find myself in while unable purchase of a second, more economical vehicle.

Thanks in advance!

 

That size above in a Cooper Discoverer AT3 would be my choice. Great all around tire, and sereral styles to choose from.

 

If you go to the LT255/80R17 size you might have tire rubbing. I would recomend going to a SL tire if you are not towing or hauling heavy loads it will make the ride more comforable and should help mpg. SL tires are also usual better for wet weather than there equvalent LT load range E counterpart. The reason for this is Tire companies design LT tires to give up some wet for increase durability.

 

If you can get past that, a set of Michelin Defenders, even in the size you currently run, would serve your stated use of the truck very well.