fuel-efficient

US /ˈfjuːəl ɪˌfɪʃ.ənt/

UK /ˈfjuːəl ɪˌfɪʃ.ənt/

1.

using fuel economically

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Modern cars are designed to be more fuel-efficient.

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Investing in fuel-efficient appliances can save money in the long run.

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economical energy-efficient low-consumption fuel-saving

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efficient efficiently efficiency fuel x-efficiency fossil fuel add fuel to the fire