rear spoiler
When the snow clears,and if its not critical to your visibility when backing into a parking space at the curb,you might take some cardboard and duct tape,and completely close off the openings through the rear spoiler.Extend the top forward until it contacts the trunklid and bend the sides over to block air spilling under the "end-plates".
See if that doesn't show up at the pump.
P.S. you could also extend the cardboard back, even with the back of the bumper for more savings.
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