The fuel systems are usually duel fuel, meaning they can use gasoline on the few "very" cold days for a very small percentage of N.America. Totally insignificant to the big picture.
If propane works in the very cold why couldn't natgas ?
Range ? What, you can't fill up a little more often or lose some trunk space.
Power, our vehicles have lots of power, way more than we need.
Diesel/Propane hybrid for trucks has been around for years.
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