I've only spent 3 or 4 days in St John's before, but I seem to remember that city driving is going to be a real challenge with all the hills. You invest a lot of energy getting up to the peak, but don't always have the opportunity to coast, unimpeded, down the other side (what with stops, lights and limited "roll-out" areas, unless you're amphibian!).
That said, I would still strongly recommend you get a gauge. You can't (easily) manage what you don't measure.
A block/coolant heater will help too, if your trips tend to be short ones.
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