If it wasn't cranking fast enough it won't start. I've seen weak batteries from new. The few cars that have had the batteries replaced already sound like they crank twice as fast as the oem. Definitely notice a difference. A stronger battery will be easier on your starter as well.
These cars flood very easily if they don't start the first try, especially in the cold. Usually holding the throttle wide open while cranking will clear it up.
Definitely get a block heater, they take 5 mins to install in these cars, it's basically just a little metal dildo that slides in a hole with some lube. We plug all our stuff in at -20c.
Thinner oil will help, a little. But shouldn't make the difference between starting or not.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)