| 1 | And it must save the world from the internal combustion engine. | |
| 2 | But, in an internal combustion engine what happens is we don't have an oxygen tank. | |
| 3 | Of course, engines designed specifically to run on ethanol can be as efficient as petrol versions. | |
| 4 | Engineers are still trying to come up with a commercially viable replacement for internal-combustion engines. | |
| 5 | If that energy could be recovered, the efficiency of the engine would be significantly increased. |
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