What's with the price of gasoline???

Yesterday I went across the border and filled up my gas guzzling SUV paying US$2.49 a gallon.  I heard on the news the price of gas was up in the lower mainland but when I was driving home at the Esso station it was CAD$1.447 a litre!    Using my CA/US gas converter app it says US$2.49 a US gallon converts to CAD$.844 a litre!  That conversion takes into account the difference in the litre/gallon and the US/CAD exchange rate.  I haven't checked the math so can't say for sure it's 100% accurate, however, I just saved a lot!  Now why is gas $.969 in Edmonton?   I know we pay a transit and carbon tax but our gasoline prices are ridiculous!!!  I realize the price in the UK is much higher but the difference in this country is mind boggling!   This retail price chart pretty much says it all.