| Answer | Crossword Clue |
|---|---|
| ETHYL | Old antiknock fuel |
| ETHYL | Antiknock fuel |
| triptane | colorless liquid, C7H17, having high antiknock properties as a fuel: used chiefly as an admixture to airplane gasolines |
| ETHYL | Old antiknock gasoline |
| COAL | Old furnace fuel |
| PEAT | Old-fashioned fuel |
| COALOIL | Old lamp fuel |
| WHALEOIL | Lamp fuel of old |
| COAL | Old-time fossil fuel |
| COAL | Old-time furnace fuel |
| COAL | Fuel for old locomotives |
| ETHYL | Old anti-knock fuel |
| COAL | Fuel for an old furnace |
| COAL | Fuel in an old furnace |
