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The claim is there, but the results are a bit.. inconclusive. It's also a bit biased, largely in part because of the ATA's influence, which also overlooks the fact that the rear end gears of autoshift trucks are at a higher ratio than 'matching' manual shift trucks. For an experienced driver who knows what they're doing with a manual, the difference can be negligible at best. For an inexperienced driver, perhaps they would be, but bad driving habits will impact the fuel mileage of an autoshift truck just the same as it will a manual truck.

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Q: Are semi trucks with auto shift transmissions more fuel efficient?
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