Sure, it is a little cheaper, but you forgot the average 60 cents a gallon tax that is added for various reasons in the US.
Trump's idea of significantly lowering gas prices is a pipe dream .
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Gasoline is a global product and if ours is even a few cents cheaper once you ship it to wherever, they will buy it, This is all controlled by the producers such as the Saudi's who subsidize their gasoline to keep their populace happy.
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You don't "know" anything, the reason gas prices are what they are is because big business read Chevron, Exxon etc find that they are at a comfortable level for maximum profit for their shareholders.
Even Communists understand economics better than you do.