I don't think the height difference will make much of a difference in your mpgs, a little, but I'm talking a fraction of 1 mpg here. True, raising a vehicle will create more wind drag and will adversely effect mpgs, but we are not talking a major lift here.
Now a WIDER tire will effect mpgs more readily, as the drag or surface friction caused by more surface area making contact with the pavement will increase.

I recently went from 235/65/17s to 265/65/17s on my Jeep Grand Cherokee and was shocked to find close to a 4.5 mpg decrease in fuel economy! However, for a recent trip to Ga., I decided to return the Superchips tune on my truck to stock and install it on the 4.7 HO in the Jeep for the trip, as the truck was gonna be parked for the month anyway. During the installation of the Performance Tune on the Jeep, I recalibrated the speedometer for the tire height difference.

I found the actual mpg difference to be more like 2.5 mpg in town and 1.5 on the interstate. The big loss of mpgs on the overhead and by hand calculations was fictitious and in actuality the difference in the speedometer being calibrated for factory size tires.

The 2.5 I can swallow, as I installed a 2" BB and the tires are also about 2" taller and an inch wider than the stockers. You are not even doing a BB (budget lift), so your losses wouldn't even be close to mine.

Go with the 265's, the look will far outweigh the minimal mpg loss...

 

245's look small, that is what i put on mine a couple months ago and getting a new set tomarrow because i cant stand the way they look, the 265 is an inch wider than the 245, a 245x75 is the same hight as a 265x70, and the 265x75 is an inch taller, and an inch makes a big difference in the look

 

Thanks to everyone for their input, I ordered the 265/70/16's. That is what I was going to do, but wanted to see what others experience was. Thanks again bros!

 

The 265/70/16's will look sooo much better, good choice.

 

BTW, what brand/model tire did you get?

 

To be completely honest... I'd love to get rid of my 265's. They are about 85-90% new and I want better MPG. Wanna buy them?

 

marker you must not have read the whole thread... the 265 - 245 thing will not be a difference in mpgs, considering you'll have to recalibrate the speedometer and everything, it'll probably end up being about the same...

when i went from 245 - 265 I lost like, .1mpg... but if you want a puny tire, more power to ya!

 

Hmm, that's odd because people in the thread I started about getting poor MPG suggested that my tires (I think they are for off road) are killing about 3 mpg.

 

do you have your window sticker, saying what came on your truck? if so, check if it came with 245 or 265, if it came with 245 and you have 265s now, it prolly was never calibrated...

 

wouldn't the tread design also have a impact? Or the width make a bigger difference? and the tire compound also. something softer would have a less MPG then a harder compound (but better traction in the rain/snow)?? As I have heard from others before. Size isn't everything!! lol