we've found the 33.3 with the ISB6.7 liter's best 'gas mileage' to be in the 58-62 mph range, and up to 12-13 mpgs when so, especially for long flat travels... we sacrifice maybe 1mpg when towing our '14 Ford Focus and fully loaded.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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