I plan to get a portable air compressor to check and adjust tire pressure with more regularity than I have done with my previous cars. I was looking at the Viair 00073 70P Heavy Duty Portable Compressor on Amazon. The product features section indicates that the car must have "a 15-ampere minimum power port rating." Does anyone have experience with this product? Anyone know what the power port rating is for the cigarette lighter on the S?