While roof racks and clamshell storage containers on top of your car can be incredibly helpful when you are transporting large items or luggage, they literally can be a drag when not in use. These car accessories can reduce your automobile’s fuel efficiency by 5%. That adds up over time, especially if you rarely use them. Simply removing them when they're not in use is one of the best things you can do to save gas.
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ANDREWS MCMEEL SYNDICATION