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Diesel engines have high torque but low rpm operating ranges, and carry heavy loads.
The range of gears allows the truck to get moving with a load and bring it up to speed utilizing the best operating conditions of the engine.
That way a reasonable engine size can be used, to operate like a passenger car the engine would have to be the size of the entire cab of the truck, and would use an outrageous amount of fuel.
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Earn +20 ptsQ: Why do trucks have so many gears?
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