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![]() ![]() ![]() This year Shell’s Starship concept truck used advanced aerodynamics and hybrid motors to attain… 8.9 mpg. Going up a steep hill, a truck's mileage might drop to about 2.9 mpg, while going down the same hill will raise it to more than 23 mpg. In 1973, the feds estimated that semis got about 5.6 miles per gallon of diesel, and today’s estimates are still abysmal.
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