| Answer | Crossword Clue |
|---|---|
| BUTANOL | Experimental biofuel |
| GRASSOLINE | Biofuel |
| ETHANOL | Biofuel choice |
| ETHYL | ... alcohol (biofuel) |
| PEANUTOIL | Biofuel source |
| ETHANOL | Biofuel option |
| ALGAE | Biofuel source |
| CORN | Biofuel source |
| ETHANOL | Type of biofuel |
| ETHANOL | Sugar-cane based Brazilian biofuel |
| ETHYL | Alcohol type used as biofuel |
| ALGA | Plant used in making biofuel |
| ETHYL | Kind of alcohol used as biofuel |
