GS Retail said Sunday that fresh food preorders at its GS25 convenience chain are gaining momentum, with the company planning to broaden the category as younger consumers lead the charge. According to the company, the service, available through its mobile app, ran four promotional events between January and February, generating about 20,000 orders and pushing fresh-food sales through the app 540 percent higher than a year earlier. The model lets customers browse and pay for perishables online an