Review on WHDZ Ram Diesel Billet Aluminum Magnetic Fuel Cap: The Ultimate Def Cap for Ram, Gas, and Diesel Vehicles! by Michael Patilla

Much better than the cheap cover that comes with the truck. I couldn't believe I was spending that much on a new truck and the gas cap is a .01 gauge piece of plastic that fits into the opening. I actually threw it away on the first fill up because it looked like garbage and then I realized I needed it. This cap is great, fits snugly into the tank port, comes with a spare rubber o-ring, and the fact that it's a magnet and I can attach it to the gas cap while I'm fueling is amazing. As this is my first diesel truck it also reminds me not to fill it up with gas :)