Kroger in Columbus is offering $1 off gas if you transfer a prescription to them.
This was mentioned in ad on from page of The Columbus Dispatch several times recently and in their sales flyer.
Keep in mind they usually only allow you to redeem one offer at pharmacy per day.
Also, unlike Giant Eagle, gas discounts max out @ $1 off per gallon no matter how many groceries & prescriptions you buy.
Giant Eagle lets you have an unlimited amount of FuelPerks -- allowing you to get a free fill up
Also your discount lasts twice as long -- lasting 60 days from end of month vs. just 30 (at Kroger).
Giant Eagle accepts the Kroger offers (bring in the Kroger ad from paper or sales flyer). They also have had their own coupons (2 or 4 at a time usually) in their dales flyer lately. They're glad to let you redeem 4 (or more) with 4 (or more) prescription transfers from competitors.