CALGARY — Plunging world oil prices have delivered a Christmas miracle of lower gasoline prices across most of Canada but a fuel price expert says motorists should fill up now because prices are expected to be volatile in 2019. Dan McTeague, a senior petroleum analyst at GasBuddy.com, says gasoline prices are at near-18-month lows because of global oil prices that have tumbled over the past two months on worries of an economic downturn, a U.S.-China trading tiff and concerns that members of the OPEC oil cartel won’t live up to…
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