| Share | Phrase |
|---|
| 7.22% | unburned constituent |
| 5.82% | chemical [domain related] constituent |
| 4.79% | noxious [producing effect] constituent |
| 4.31% | oxidize constituent [perform operation] |
| 3.32% | gas constituent |
| 3.29% | aromatic [scent] constituent |
| 2.92% | exhaust [physical/chemical] constituent |
| 2.85% | constituent concentration |
| 2.80% | undesirable [evaluation] constituent |
| 2.75% | molecular [structure] constituent |
| 2.56% | unburnt constituent |
| 2.32% | harmful [producing effect] constituent |
| 1.95% | constituent [connection] display |
| 1.93% | passing constituent |
| 1.90% | major [importance] constituent |
| 1.76% | contain constituent |
| 1.67% | asphaltic constituent |
| 1.64% | parameter for constituent |
| 1.55% | dissimilar [similarity] constituent |
| 1.52% | constituent emission |
| 1.50% | heavier constituent |
| 1.44% | contain constituent [perform operation] |
| 1.44% | weight constituent |
| 1.41% | constituent in gas |
| 1.41% | constituent combination |
| 1.35% | residual [amount] constituent |
| 1.35% | main [importance] constituent |
| 1.34% | unwanted [effectiveness] constituent |
| 1.19% | deposit constituent [perform operation] |
| 1.18% | fuel constituent |
| 1.16% | toxic [producing effect] constituent |
| 1.15% | volatile [time periodicity] constituent |
| 1.12% | constituent [does] adhere |
| 1.09% | characterize constituent [perform operation] |
| 0.97% | constituent [degree] compose |
| 0.93% | stream constituent |
| 0.93% | charge constituent |
| 0.92% | remaining [amount] constituent |
| 0.91% | individual [dependency] constituent |
| 0.91% | mineral constituent |
| 0.91% | constituent oxidation |
| 0.88% | exhaust [physical/chemical] constituent |
| 0.88% | reactive [physical/chemical] constituent |
| 0.86% | coolant constituent |
| 0.79% | constituent blend |
| 0.79% | regulated constituent |
| 0.78% | combine constituent [perform operation] |
| 0.73% | least [degree] constituent |
| 0.70% | solid [state] constituent |
| 0.65% | constituent level |
| 0.63% | stoichiometric [physical/chemical] constituent |
| 0.63% | remove constituent [perform operation] |
| 0.61% | burn constituent [perform operation] |
| 0.58% | reduce constituent [perform operation] |
| 0.50% | liquid [state] constituent |
| 0.50% | air-fuel constituent |
| 0.44% | decrease constituent [perform operation] |
| 0.43% | low [size] constituent |
| 0.42% | suitable [effectiveness] constituent |
| 0.42% | constituent [does] remain |
| 0.42% | constituent [does] include |
| 0.39% | improve constituent [perform operation] |
| 0.39% | specific [typicality] constituent |
| 0.37% | range constituent |
| 0.36% | amount constituent |
| 0.35% | represent constituent [perform operation] |
| 0.31% | eliminate constituent [perform operation] |
| 0.27% | have constituent [perform operation] |
| 0.23% | produce constituent [perform operation] |
| 0.22% | not constituent |
| 0.19% | air constituent |
| 0.13% | constituent [does] have |
| 0.12% | include constituent [perform operation] |
| 0.12% | provide constituent [perform operation] |