Two ways to get your decal:
Stop by any participating Sunoco Station and pick one up for free. Find a Sunoco near you
By mail: Send a self-addressed stamped envelope along with a 3×5 card with your name, home mailing address, age, and phone number to:
Sunoco Free Fuel 5000 Sweepstakes Decal Request
c/o Department 585547
P.O. Box 5046
Kalamazoo, MI 49003-5046
https://www.gosunoco.com/contests-and-sweepstakes/free-fuel-5000/