"We did our fuel efficiency test and a bunch of other tests on that car," Fisher says.

“我们对那辆车进行了燃油效率测试以及一系列的其他测试，”费希尔说。

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The longest previous hypersonic scramjet flight test, performed by a NASA X-43 in 2004, was faster, but lasted only about 10 seconds and used less logistically supportable hydrogen fuel.

先前最长的冲压式喷气发动机下极超音速飞行测试，是在2004年由NASA的X-43进行的，速度更快，但只持续了10s。

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With oil prices moderating – crude is down slightly in the $93 a barrel range Wednesday – if those fuel surcharges decrease it could be a test for FedEx’s U.S. business.

随着油价回落——周三原油价格略微低于93美元每桶，如果燃油附加费降低，这将成为联邦快递美国业务的一个考验。

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One telling sign could be the nature of the fuel used in the test, though that is not yet clear.

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The CR test car got about 30 mpg on premium fuel, and about 27 mpg on high-test when the engine was running.

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The company provides contract engineering services and test equipment for fuel cell developers.

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