What is the most efficient engine?

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Tags

1. #electric
2. #cycle
3. #turbine
4. #efficient
5. #efficiency
6. #combined
7. #powerful
8. #combustion
9. #turbines
10. #among
11. #world
12. #thermal
13. #general
14. #electrical
15. #rated
16. #engine
17. #engines
18. #plants
19. #internal