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What is the most fuel-efficient engine option for the BMW M9?

I am considering purchasing a BMW M9 and I am wondering which engine option would be the most fuel-efficient. Any recommendations or personal experiences?

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J

The best engine option for fuel efficiency would be the 3.0L inline-six-cylinder engine with electric motor, offering an impressive 72 MPGe.

E

I have found that the diesel engine option is also a great choice for fuel efficiency, with an estimated 50 MPG on the highway.

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