| Answer | Crossword Clue |
|---|---|
| REGULARGASOLINE | 87-octane fuel |
| REGULARGAS | 87 octane |
| REGULAR | 87-octane gas |
| PREMIUMGASOLINE | High-octane fuel |
| isooctane | a fuel of the same octane rating |
| isooctanes | ISOOCTANE, a fuel of the same octane rating |
| alkylated | the act or process of introducing one or more alkyl groups into a compound (as to increase octane number in a motor fuel) |
