| Answer | Crossword Clue |
|---|---|
| ETHYL | Antiknock gas. |
| ETHYL | Antiknock gas |
| ETHYL | Antiknock fluid |
| ETHYL | Antiknock ingredient |
| ETHYL | Antiknock compound |
| ETHYLS | Antiknock fluids |
| ETHYL | Antiknock fuel |
| ETHYL | Antiknock additive |
| ETHYLS | Antiknock fluids. |
| ETHYL | Antiknock agent |
| ETHER | Antiknock additive |
| OCTANE | Antiknock number |
| ETHYL | Old antiknock fuel |
| ETHYL | Old antiknock gasoline |
| OCTANE | Antiknock need, with high |
| TOLUENES | Solvents often found in antiknock additives |
