Which has a more efficient 'engine': A tuna or a whale?

Which has a more efficient 'engine': A tuna or a whale?
Chicago IL (SPX) May 14, 2014 - A large gray whale and a much smaller skipjack tuna each propels itself through water. Which is the more efficient swimmer? It has been difficult to compare propulsion efficiencies of animals of different sizes, like comparing apples and oranges, but now Northwestern University researchers have developed a new metric, or standard, to measure individual energy consumption efficiency and make such ... morehttp://www.terradaily.com/reports/Which_has_a_more_efficient_engine_A_tuna_or_a_whale_999.html

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