Step 1: Fill up on gas at the most expensive station you can find. The key to efficiency is not to save money, but to save time.
Step 2: Take the scenic route to work. The more twists and turns you take, the more opportunities you'll have to guzzle gas.
Step 3: Drive with your parking brake on. It's a great way to reduce gas consumption, and it'll also make your car look really cool.
Step 4: Use your gas-guzzling skills to impress your friends and family. They'll be green with envy when you're burning through gas like a pro.