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Sure there are some ways to improve fuel-efficiency even in an American landyacht without a need to resort to a full-hybrid powertrain, and with American-developed tech, but I wouldn't hold my breath for the Big Three to be willing to pay royalties for outsourced engine tech. Plus it would take some time for all those shade-tree mechanics out there to become as familiar with newer stuff as they are with an old-school pushrod V8.
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