The units run on natural gas which gives them about 48 percent efficiencyoverall. Smaller natural gas fuel cells are already being marketing in Japan.
该电池单元使用天然气，这将会提供约48%的能效。稍小型的天然气电池正在日本市场出售。
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Thepetrol engine is optimally sized to provide the cruise power at its most efficient operating point, resulting in an improved fuel efficiencyoverall.