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Nitogen in the tires as in a Airplane, they also do that in Racecar tires ,it keeps the pressure the same even when the tires and inside air in them gets warmed up .
Im wondering about the "donut spare" the small spare tires that say Dont go over 45 on the side and they are good for 60 PSI , has anyone ever ran a set of 4 of these and seem how they handle and what kind of gas mileage improvment they provide? I have 5 or 6 15" donut spares I would like to try out but would like to hear some real life experiance with them Scott
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