Originally Posted by 1325

How long has it been since you purchased it from the dealer? It could have been coincidental that it lost some air during that time frame and the experienced temperature. When I had tires filled with nitrogen and I attempted to fill up with regular air, the gauge read low as nitrogen molecules are larger than that of compressed air. I'd take it to the dealer and have them refill (they should for free) or any place that offers nitrogen fill.