In article <OSWsk.40860$hx.30526@pd7urf3no>,
"Andy" <brackenburn@shaw.-deletethisbit-ca> wrote:

> How does Minneapolis cope at -30F with the current generation of
> gasoline-burning vehicles "spewing water vapor onto the roads"? After
> all, gasoline is a HYDROcarbon. On being burned, the hydrogen part
> is converted to water, exactly the same as when pure hydrogen is
> burned or converted in a fuel cell.

The water vapor in gasoline exhaust is fractionally water vapor, not
wholly water vapor.