| become popular | 0.59 |
| run on electricity | 0.56 |
| use battery | 0.48 |
| use diesel | 0.47 |
| save money | 0.43 |
| use less fuel | 0.43 |
| run on gas | 0.41 |
| get 60 mpg | 0.41 |
| use two power sources | 0.30 |
| revolutionize gas envir… | 0.29 |
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| electric motor | 0.70 |
| two engines | 0.25 |
| dual mode | 0.16 |
| expensive | 0.63 |
| efficient | 0.63 |
| the best option | 0.51 |
| quiet | 0.38 |
| exempt | 0.38 |
| small | 0.38 |
| mainstream | 0.37 |
| slow | 0.32 |
| complex | 0.26 |
| car | 0.59 |
| cross | 0.25 |
| the best invention | 0.22 |
| many reasons | 0.22 |
| permitted | 0.30 |
| compared to conventiona… | 0.29 |
| seen in road | 0.25 |
| charged | 0.25 |
| recharged | 0.25 |
| expensive to insure | 0.16 |