While most trucking fleets know the value of tire pressure monitoring systems (TPMS), some are hesitant to purchase the systems because of the initial investment, but cost can be a relative term. Jon Intagliata, product manager of tire management and wheel-end systems for Dana's Commercial Vehicle Products Groups, says, a good TPMS addresses two of the top three operating expenses of a fleet -- fuel and tires. By properly maintaining a vehicle's tires, fleets can definitely improve fuel economy and tire life. According to Peggy Fisher, president of TireStamp Inc, there are six components that fleets should include when calculating ROI: labor, tread mileage, casing life, enroute emergency delays, fuel economy and safety. Frank Sonzala, EVP of Pressure System International (PSI), suggested that fleets can calculate their ROI, by using the ROI calculators on various ATIS Web sites. AivinMeritor and PSI both have ROI calculators built in their Web sites, he added.