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I'm betting that driving with the spoiler up will also decrease fuel economy. This makes me think that if I'm going to settle into a long cruise control-controlled ride at 70 mph on the freeway after passing a truck at 80 mph, I should slow down below 50 mph just to lower the spoiler and then raise the speed back up to 70 and ride spoiler-free.
Problem is I don't think about that spoiler since I can't see it and rarely think about it.
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