If you are looking for a large daysailer or a small cruising sailboat, you may be choosing between sailboats that have an inboard engine and those having an outboard motor.

当你在选择大型的日间帆船（不用于过夜航行的——译者注），或一艘小型的远航帆船时，你可能会面临在配置舷内发动机或舷外发动机的帆船之间做出选择。

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Yet so efficient is the engine, says the Danish chief engineer, that cruising at an average of 17 knots the ship consumes just 3 grams of fuel per tonne per nautical mile-which certainly sounds low.

发动机效率很高，丹麦首席工程师指出，船每平均行驶17节，每海里每吨货物只消耗3克燃料-这听起来肯定算很低了。

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Fuel consumption and emission levels can then be measured (for urban driving, say, or cruising at a particular speed) and the engine's tuning adjusted accordingly.

ECONOMIST: Car design

You can also buy a car that shuts down one or more engine cylinders when it is coasting, or cruising under a light load, reducing fuel consumption without sacrificing performance.

FORBES: 10 Ways Automakers Are Helping You Spend Less On Gasoline