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Our 2008 Chevy Silverado 1500, C/C does have Nitrogen in the tires and the only difference I have found the tires seem to maintain the same pressure. I haven't had to add air since we bought the Truck. However its being stored for the winter in a fully inclosed building and yesterday I got my monthly report from On-Star and the air pressure is the Same as the last 3 months. However for the advantage of having Nitrogen installed (Cost/availablity) I don't plan on going to Nitrogen in any other tires. We have a portable air compressor and whe have a full air system on the Freigtliner and have a quick disconnect for Air source at anytime so I really don't work about free air. GBY.....
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