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Would a small engine working really hard but with minimal power be more fuel efficient than an enormous engine not working at all attempting to move an identical weighted object? - Quora
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Mythbusted: Is a smaller engine always more fuel efficient? - Sgcarmart
Mythbusted: Is a smaller engine always more fuel efficient? - Sgcarmart
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NASA, US Industry Accelerate Advancement of Small Core Aircraft Engine | NASA
Does a smaller car engine mean better fuel consumption?' [Newbie Guide]
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How Engines Are Becoming More Fuel Efficient - YouTube