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Under those conditions engines are producing just enough power to overcome rolling resistance and wind resistance. Depending on the vehicle, only a small fraction of the engine's rated power is required, perhaps 10%. A Saab Sonnett V-4 would likely be more efficient than a Ford Cortina I-4 due to lower air drag. A Chrysler NewYorker or an Olds 98 might require roughly twice the power of the smaller cars. A fuel delivery system determines how much air/fuel mixture is available not how much is required.
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