>

It depends on which system is more efficient, the electrical 12v one
or the direct flame system. It may well be (though I don't know the
answer) that the drag on the alternator and therefore the engine
created by the 12v heating element puts more hydrocarbons in the air
than the waste from the propane flame.

Jim

>
> I still don't understand why anyone would want to waste
> unmeasurable propane
> when driving, instead of using battery power that is not used
> otherwise.
> It's inefficient, too, adds to your greenhouse gas emissions
> instead of
> using a power source your van is creating anyway.
>
>
>
> Joy
>