Like many on this forum, I've never been completely comfortable driving my GranSport knowing that I have no spare tire and no tire pressure monitoring system (TPMS). Just discovered an easy solution: the Tyredog TPMS1000 - a wireless system with sensors/transmitters that replace the valvestem caps and screw onto each tire valvestem. Receiver is small and fits into visor recess. Unlike the PIAA system sold by TireRack, there is no need to dismount/remount tires, so it's a free 10-minute installation. I got mine from AutoSport online catalog, ($250), and so far. it works as advertised.