| Typicality: | 0.581 |
| Saliency: | 0.537 |
| depending on the model | 12 | other |
| to improve fuel economy | 6 | purpose |
| on heavy fuel oil | 4 | other |
| engine → run on → natural gas | 26 |
| engine → use → natural gas | 17 |
| engine → operate on → natural gas | 12 |
| engine → be → natural gas | 9 |
| engine → operate on → renewable natural gas | 6 |
| engine → be operated on → natural gas | 5 |
| engine → burn → natural gas | 4 |
| engine → be run on → natural gas | 4 |
| negative | neutral | positive |
| 0.086 | 0.690 | 0.223 |
| Raw frequency | 83 |
| Normalized frequency | 0.537 |
| Modifier score | 0.814 |
| Perplexity | 55.950 |