You seem to have a serious problem in sub-zero temperatures and maybe Canadian gas use will require further development with heating units etc before it is universally acceptable. Of course in those temperatures EVERY engine has its problems - you don't see engine warmers on cars or aircraft in Australia.
Gas does not need higher compressions to work as well as petrol. If you read the above thread you will see that compression is not mentioned in the various problems discussed. There are tens (hundreds?) of thousands of vehicles in Australia alone running on gas conversions switching from petrol to gas as they drive along with no discernable change in performance or reliability.
I have probably 250,000km in dual fuel gas/petrol converted cars ranging from Ford V8's to Toyota and Nissan straight 6's to GM V6's. Apart from saving tens of thousands of dollars they all performed with reliability and performance equal to or better than their original petrol only brothers.
Don't give up Canada, I am sure there is a way to use LPG in a cold climate with a bit of inventive experimentation.
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