| Answer | Crossword Clue |
|---|---|
| MOPED | Fuel-efficient hybrid |
| MOPED | Fuel-efficient transport |
| AVEO | Fuel-efficient Chevy |
| MOPED | Fuel-efficient vehicle |
| PRIUS | Fuel-efficient Toyota |
| MOPED | Fuel-efficient transportation |
| SOLARCAR | Fuel-efficient transport |
| ECOCARS | Fuel-efficient vehicles |
| MINI | ... Cooper (fuel-efficient car) |
| HUMMERS | Non-fuel-efficient vehicles |
| GASHOG | It's far from fuel-efficient |
