| Answer | Crossword Clue |
|---|---|
| ETHANOL | Common gasoline additive |
| ETHANOL | Gasoline additive |
| ETHYL | Gasoline additive |
| OCTANE | Gasoline additive. |
| ANTIKNOCK | Gasoline additive |
| ETHYL | Gasoline additive. |
| TOLUENE | Gasoline additive |
| STP | Gasoline additive |
| TCP | Gasoline additive: Abbr. |
| STP | Gasoline additive brand |
| ETHYL | Former gasoline additive |
| ETHYL | ... alcohol, gasoline additive |
| STP | Gasoline-additive initials |
| ETHER | Part of the gasoline additive M.T.B.E. |
