I'm going on a big national car trip, and I want to increase cargo space by getting a roof rack, but I'm wondering how much the additional drag will increase my gas bill. Is there any way to figure this out?

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I'm going backpacking for a month in Iceland and I plan to pack lightly (clothes for a week). Laundromat are very popular in some country but almost unheard of in others and, apparently, Iceland is such a place: LAUNDRY: Self-service laundromats are not common in Iceland, but most hotel...