A free interactive payback calculator for computing auxiliary power unit (APU) cost savings is now available
online from the ComfortGuard people at Cummins. This ROI calculator conveniently figures in tractor operation and
maintenance costs, ComfortGuard APU maintenance costs, and purchase price and comes up with the resulting annual savings, savings per mile, and estimated payback time. Features include the ability to easily print out a summary of your calculations and/or e-mail a report to a colleague.

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