Question

which is the high fuel efficient engine​

Answer 1

Answer:

Diesel engines generally achieve greater fuel efficiency than petrol (gasoline) engines. Passenger car diesel engines have energy efficiency of up to 41% but more typically 30%, and petrol engines of up to 37.3%, but more typically 20%.

Explanation:

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Answer 2

Answer:

The new Wärtsilä 31 is the most fuel-efficient four-stroke engine currently available on the market.