I finally took my own advice and cleaned out some of the magazine recycling from the trunk of my car. (After checking that I couldn't sell the magazines on eBay, of course.)

If you're carrying around junk that you don't need in your car (or important stuff that you don't need in your car -- basically anything that has mass) your gas mileage is suffering. About 1 MPG per 100 pounds of extra stuff.

Your friends will appreciate that your lead brick collection is now stored in your garage and away from where they put their feet.