| as the working fluid | 6 | manner |
| to mix with the fuel | 5 | purpose |
| from the outside | 5 | transitive-object |
| engine → need → air | 27 |
| engine → use → air | 14 |
| engine → be → air | 13 |
| engine → require → air | 4 |
| negative | neutral | positive |
| 0.139 | 0.738 | 0.123 |
| Raw frequency | 58 |
| Normalized frequency | 0.479 |
| Modifier score | 0.625 |
| Perplexity | 173.493 |