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1) Diesel Engine is more efficient and there is more energy in the fuel
2) Big rig engines operate in an efficient narrow band
3) Low power to weight ratio
4) Better Driving habits and bulk of the time spent cruising
5) Aero Drag is smaller on a per pound basis (being both heavy and long are advantages here)
6) Semis are optimized to reduce cost of operation above all other criteria.
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