Sorry, no online dictionaries contain the exact phrase fuel inefficiency.
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Reverse dictionary results:
1. inefficacy
 2. lack
3. effectiveness
4. failure
5. ineffectiveness
6. remiss
7. effective
8. shiftless
9. backfire
10. diesel
 11. economizer
12. flame-out
13. hog
14. mileage
15. powered
16. spent
17. stall
18. ute
19. weak
20. gas guzzler
 21. anergia
22. athermancy
23. black
24. blackout
25. blow out
26. booster
27. brownout
28. cardiac glucoside
29. cardiac glycoside
30. catastrophe
 31. circulatory failure
32. coronary failure
33. cripple
34. deed
35. demon
36. dilute
37. disability
38. doer
39. dog-tired
40. duty

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