For those of you who have a Murphy's Gas in your area (these are the gas stations that are found at Wal-Mart), they frequently offer discount coupons on gas, diesel, and sometimes sodas. If you sign up for their e-mails, they will send you an occasional e-mail announcing their deals and often give you an opportunity to print off a coupon.
The coupons are typically for a specific short time frame so make sure you read it. Today, I printed off a $3 off of a $10 gas purchase coupon that is good today and tomorrow only (May 22nd and 23rd). If you are interested, here is the link: http://murphyusa.com. All you have to do is visit the link and click on the the image in the upper right hand corner that says "Murph e-offers Sign Up Now!" to register for their e-mails.
Disclosure: I am not in any way connected with Murphy's. I just wanted to pass along this great method of savings!