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cmillsap · (This post was last modified: 02-08-2015 00:10 by cmillsap.)

I’m going to buy new Michelin 315/80r/22.5 XZA2 Energy tires for my bus through the Michelin Advantage Program. My Michelin tire dealer suggested I fill the new tires with nitrogen at an added cost of $25 per tire. They tell me that one benefit is that nitrogen filled tires maintain a more even pressure (approx. a 3# variation) as compared to air filled tires as they heat up and cool off. That can be as much as 15 to 20 psi during normal service. Nitrogen may be somewhat beneficial if you have a tire monitoring system because you can set the monitoring parameters more closely. At $200 to fill 8 tires with nitrogen, I’m not so sure it’s worth it unless there are other good reasons to switch to nitrogen that I am unaware of. I’ve heard stories of people claiming they get better mileage with tires filled with nitrogen but I’m skeptical of that claim. Maybe someone can clue me in to other advantages of filling your tires with nitrogen?