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Yes, to the first question, and maybe to the second. I run nitrogenated tires on both my vehicles. I also have the tires siped which, IMO, helps considerably with traction and wear reduction. The problem I see with "normally" serviced nitrogen is that you are not getting 100% pure nitrogen. The only way to do that is to evacuate the tire (like you evacuate and A/C system) and fill it with 100% nitrogen. A second tire stem in the wheel could allow for this. As is at the local nitro. service center, they let out as much air as possible and then re-service with nitrogen. I am not saying there might be some benefit to it for street use, but I still get ~4-6 PSI fluctuation between cold and hot tires. If the nitro. was 100% there would be almost no change in pressure. I think the only reason I keep doing it now is because it's free. I paid $20 for each vehicle, and after that all reservicing is free forever. Bottom line, if it helps one iota, I'll take it.
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