Thread: Why are tractor-trailer rig so much more fuel efficient
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Old 10-30-2008, 11:11 AM   #78 (permalink)
pugmanic
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Hype-brid - '10 Toyota Auris HSD T-Spirit
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Engine size to wehicle weight ratio. (smaller engine under higher stress is more economical)

Time at cruising speed.

Alsorts of reasons...
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