| Share | Phrase |
|---|
| 14.17% | extra [importance] fuel |
| 6.71% | extra [importance] concentration |
| 5.91% | extra [importance] air |
| 5.38% | extra [importance] power |
| 4.93% | extra [importance] cost |
| 4.93% | extra [importance] amount |
| 4.54% | extra [importance] component |
| 3.83% | extra [importance] weight |
| 3.33% | extra [importance] measure |
| 3.17% | extra [importance] injection |
| 3.08% | extra [importance] space |
| 2.67% | extra [importance] work |
| 2.67% | extra [importance] valve |
| 2.61% | extra [importance] circuit |
| 2.44% | extra [importance] length |
| 2.29% | extra [importance] time |
| 2.25% | extra [importance] step |
| 2.18% | extra [importance] oxygen |
| 2.14% | extra [importance] quantity |
| 2.12% | extra [importance] load |
| 1.90% | extra [importance] force |
| 1.85% | extra [importance] connection |
| 1.85% | extra [importance] part |
| 1.84% | extra [importance] pressure |
| 1.70% | extra [importance] pulse |
| 1.70% | extra [importance] travel |
| 1.67% | extra [importance] pump |
| 1.54% | extra [importance] passage |
| 1.50% | extra [importance] effort |
| 1.50% | extra [importance] energy |
| 1.46% | extra [importance] sensor |