Is Revving an engine bad?

Related questions

1. What happens when RPM is high?
2. Is it bad to drive with high rpm?
3. Does driving slower save gas?
4. Does revving engine charge battery faster?
5. How is RPM related to speed?
6. What is Kra in DepEd?
7. What is the purpose of RPMs?
8. What does it mean when the RPM is high?
9. What is the engine RPM?
10. Is revving a car illegal?

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18. #friction
19. #think