Usually, squeaking significant extra mileage out of a vehicle involves some very conspicuous changes. You can switch to a new engine, go hybrid (or full electric), or build components out of lightweight materials like carbon fiber. GM, however, is...
Usually, squeaking significant extra mileage out of a vehicle involves some very conspicuous changes. You can switch to a new engine, go hybrid (or full electric), or build components out of lightweight materials like carbon fiber. GM, however, is...
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