At present, except the small proportion of the pure natural gas engines, CNG vehicle powered device is basically flexible-fuel engine that can use natural gas or gasoline dividedly.

目前，我国的CNG汽车动力装置，除比例很小的纯天然气发动机之外，基本上是可以分别燃用天然气和汽油的两用燃料发动机。

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Engineers believe it could be used to boost the performance of small gasoline engines.

FORBES: Clearing the Air

In 2008, as a reporter at Forbes, I investigated the likely impact of rising ethanol blends in the U.S. gasoline supply on small-engines in boats and outdoor equipment.

FORBES: Biggest Battle Yet for Biofuels Begins

Take a 20 kilometers-per-liter hybrid, which is a small car with two engines--one gasoline, one electric--that work in collaboration.

FORBES: Magazine Article