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What semi truck engine gives the best fuel mileage?

The most fuel-efficient semi truck engine on the market is the Cummins X15 Efficiency Series engine. It is a 15-liter diesel engine that produces up to 500 horsepower and 1,850 lb-ft of torque. It is also EPA-certified to meet the latest emissions standards. In terms of fuel efficiency, the X15 Efficiency Series engine can achieve up to 12.5 miles per gallon (MPG). This makes it one of the most fuel-efficient semi truck engines available.
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