Tires And Gas Milage

[Preacher]

okay... i've got an easy question. i bought my bronco last month and it had 225/75r15's on it and i know that the stock tires are 265/75r15's. i drive abought 52 miles a day to and from workmy average speed is 60 mph. i live out in the middle of nowhere so i have to come to a full stop only once. my question is this: if i swap the 225's for some 31's will that make my gas milage go down. i really hate the tires that are on there now; they make it look like a midget bronco. the tires are bald so i have to get new tires anyway. i just want to make sure that my milage won't go down TOO much. TIA...

 

[Jes4Kix]

here is a link to a chart that will help you figure out your highway rpm for various tire sizes and general performance guidelines

http://www.4wheelparts.com/Tirel_gear_ratio.asp

hope this helps

 

[davids78bronco]

the 265 size tires are about 31" tall anyway, so whichever set you choose will be better. You fuel mileage will likely increase, but only by a bit, since the slightly larger tire is getting fewer revolutions per minute, allowing the engine to run at a slightly slower speed, saving a little bit of fuel. BUT, that doesn't mean that running 33-35" tires on stock gears will make for even better fuel mileage, it won't

But to answer your question, the 31s will work perfectly well with your Bronco