I've noticed that every time my MPG drops to the 40-42 range, I find that I'm also driving on tires that are almost flat.
I refilled the tires and the MPG jumped back up to 46.5 (normal for my terrain, driving style, and available gasoline formula).
So... Is it *normal* for the tires on an HCH to go flat every 3-4 weeks, or do I have a bum set of tires?

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