How much does tire width affect MPG?

[leojr]

I currently have a near brand new set of load range E, 235 width tires on my new-to-me OSB. I'd prefer to have a wider tire primarily for looks. I'd buy a second set of rims just for wider tires for the looks and a cushier ride if it makes sense.

My question is: How much do the wider tires affect MPG? Most of my current driving is city streets and FM roads, very little freeway miles. But, I have a 16 hour each way family road trip next month and am trying to justify a smother ride. But at what fuel cost penalty?

Thanks!!

[elrojo63]

235 tires ride great and I think it does make a difference in mpg and also initial purchase cost


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[351fifty]

they shouldnt make enough of a difference to notice but maybe half an mpg, at most