SH> I hadn't realized one could have dual fuel as I thought it was one or the
 SH> other but the idea sounds intriguing.  But my big objection to propane was
 SH> loss of trunk space.

Didn't know you did drive on propane.
Here the new is to drive on Methane which is almost exhaust-free and the Methane
comes from a recycling plant.

 SH> As for the age of your vehicle, I'd want something newer and have that.
 SH> My 2003 Honda Accord does not need to be plugged in until the temperature
 SH> hits -30.

Do you know that you will save twice as much money on the gasoline when using a
block heater then you pay for electricity for it, even at -5 when not using
it for more
then 3 hours?
And you will spare your engine as well. There isn't anything like a cold-start that
wears out your engine. I have seen, during my years att SAAB, what cold-starts do
to engines. It isn't nice I can tell you. 2 deepfrozen metals rubbing each other
without any oil between. 

//Bj”rn

---