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If you measure fuel in versus power out, import engines are NOT more efficient. The Corvette Z06 is rated at 19mpg city/28mpg highway... that's better than the much slower NSX (17/24). Remember... the 'Vette's engine is twice as large but spins half as fast. It's also a lot more cost efficient...
There are other measures of efficiency - the older generations of rotary engine are very space- and heat-efficient but yet they blow most of their fuel right out the exhaust and return dismal fuel economy. The modern Renesis rotary in the RX-8 is supposed to compare favorably to similar piston engines (such as the S2000's F20C) in that respect though.
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