From Sam Vilain,<br/>Oakland, California, US
Cannell mentions the benefits of running vehicles on liquid petroleum gas (LPG). It does produce less nitrous oxide and other pollutants and is less carbon intensive than petrol/gasoline. But this gain is more than countered by the low efficiency of a small internal combustion engine (20 per cent) compared with burning fuel for electricity generation (around 37 per cent for coal and 62 per cent for combined-cycle gas) to charge electric cars. And there isn't enough LPG in crude oil for it to be a significant replacement for petrol and diesel.
