I use Nitrogen in my tires on all my vehicles because I use it with my job and can fill 16 sets of tires for $3 bucks. I get about 1.5 mpg better because they stay at close to constant pressure (would be same if I checked them all the time?). The ride is a touch stiffer (due to larger molecules) but Nitrogen does not expand as much and maintains pressure better over time. I used to add air to my tires once every three weeks but Nitrogen holds for 1.5 months or so because of the larger molecules again. I check my tires cool on ‘air’ and then drive on highway trip and there is about a 6-8 pound greater pressure difference with just air, yet Nitrogen is only about 1-2 pounds greater which keeps tires from wearing. That being said, I still think Nitrogen is a waste of money for the typical charge of $35 dollars. Just wondered what you guys thought about it?