Its not as daft an idea as it first sounds :)

10% (v/v) will give you a -4C freezing point depression, 20% (v/v)
will give you a -9C depression.

water tank capacity is 50 litres right?  Damned thing is ethanol cost
is mostly taxes. If you could get some tax free stuff...

alistair

On 13-Mar-11, at 10:23 AM, mcneely4@COX.NET wrote:

> I suppose one could add a little ethanol, for those who want it.
> Haven't calculated requirements by volume, but of course if children
> or the abstemious are involved, no go.   mcneely