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It's just there as an alternative maintenance tracking system for vehicles that see lots of slow or stationary use; ambulances, PTO's, trucks with lifts, public transit, delivery, etc. There's a conversion of hours to miles, 1 hour is 25 miles according to at least one Ford publication. Averagine 42mph only means you spend more time on the highway than in traffic, and that you're probalby on the correct maintenance schedule using mileage.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.