What does HDI mean on a car?

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Tags

1. #under
2. #directly
3. #chamber
4. #engine
5. #injection
6. #direct
7. #turbo
8. #peugeot
9. #combustion
10. #diesel
11. #system
12. #common
13. #injects
14. #pressure
15. #citroen
16. #which