I found this deal while searching for deals online for Chevron Techron Complete Fuel Cleaner. You can buy 3 cases(6x) of Chevron products and received $20 Amazon gift cards.
You can mix and match all the products to qualify for the promotion, that includes fuel additives, motor oil, transmission flkuid, grease, etc.
3 cases of 6x 12oz Techron = $30.59 x 3 = $91.77 – $20 net price is $71.77 or $4 each
Regardless of the products, qualified 3x products will get you the $20 gift card