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Most of my Fiesta tanks average right at 38 MPH speed. When they talk about 14 hours a day behind the wheel, it's an assumption to include any stops in that time, since the stops are not "behind the wheel.
Take the older US routes (at least here) and traffic volume is much less than the Interstates. It would be relevant to see their route map. I'll bet they used the Interstates to get around congested areas and mainly used the older US routes (non interstate) for the vast majority of their trip.
Highway speeds? 40-50 MPH depending on the best BSFC speed in top gear, versus lowest aero drag.
regards
Mech
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