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It's a title traditionally held by Detroit Diesel's 60 Series motors. Volvo claims their D series motors are, but only under the most ideal of circumstances do you ever achieve what the manufacturer claims you will with them.In the hands of a good driver, I have seen the PACCAR MX-13 average over 9 MPG.

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Q: What semi truck engine gives the best fuel mileage?
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Which full size pickup truck gets the best fuel mileage?

The best gas mileage truck is the 2011 Ford F150's which get 23 MPG on the highway with the V6 engine.


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