Roaring Toyz Quick-Release Gas Cap
As long as you don't have any enemies or crazy exes that might want to sugar your tank, there's a great replacement gas cap available from Roaring Toyz. At 50 percent lighter than stock and a lot easier to use (it unscrews without a key) the quick-release cap is a fast and easy way to upgrade your bike's appearance and efficiency.
It only needs a one-eighth turn to open, which means you can get in and out of the station in a snap. Also, the cap comes with a check valve for proper ventilation.