fuel efficiency
fuel economy
Porsche has unveiled its most fuel-efficient model yet.
Gains in fuel efficiency and noise reduction could also come from embedding the engines into the topside of the fuselage.

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Open the tool →燃油效率 (rán yóu xiào lǜ) means “fuel efficiency, fuel economy”.
燃油效率 is pronounced rán yóu xiào lǜ in Mandarin Chinese.
“fuel efficiency” is 燃油效率 (rán yóu xiào lǜ) in Chinese.
This page has 2 example sentences using 燃油效率, each with pinyin and an English translation.