With average gas prices staying well over $4 in Maryland, Wawa is offering a major discount to residents who use the store's mobile app to fuel up.

Customers can get a discount of $0.15 per gallon at any Wawa through June 12, if they're Wawa Rewards members and use the Wawa app on their phone to activate a fuel pump.

Wawa has already had a Mobile App Fuel Discount and is now extending it, the company said, noting that more than 250,000 Rewards members have already used the discount.

Dena Pizzutti, Sr. Mgr. of Personalization for Wawa, said in a statement:

For more information, visit https://www.wawa.com/mobile-app/fuel-activation. [wawa.com]

Maryland's gas-tax holiday, meanwhile, ended in April.

WMAR's Mark Roper previously profiled ways to save by using gas stations at supermarkets like Weis. Brittney Verner also offered some ways to save in March.