Tire pressure control systems (TPCS) or central tire inflation (CTI) systems are becoming popular in Canadian forestry operations as a means of increasing the mobility of log trucks and extending the hauling season. However, very little information is available that quantifies their ownership and operating costs. FERIC monitored the Redline-Eltek TPCS and the Eaton TPCS over a three-year period. The study involved 24 log trucks of various configurations working at six locations in western Canada. This report presents the TPCS ownership and operating costs of these 24 trucks and describes how truck utilization affects the TPCS and truck ownership costs.