The promotion launched Monday, when a Shell station in Garner offered the same deal.
In a press release, the company calls the deal a "celebration of the Raleigh-Durham community" and encourages customers to sign up for Fuel Rewards.
Free gas will be available at the location at 1390 N.W. Maynard Road starting at 10 a.m. The promotion will end at 11 a.m. or after the first 100 customers receive free fuel.
According to Shell, giveaways and gift cards will also be offered on Tuesday.