Oxygen-Bar Tender asked:


I drive a 2000 Nissan Frontier with a V-6 engine that has the following characteristics in fifth gear with cruise control on the highway: @70 mph= 3000 rpm, @65 mph=2750 rpm, @60 mph= 2500 rpm, @45 mph= 2000 rpm. At what highway speed would fuel economy be maximized while still maintaining a descent speed. The highway I drive on has a speed limit of 70 mph.

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