Yes, it's a gas station. YES! It's worth stopping! The food is very good! Locals kept coming in for takeout while we sat down to eat in one of the three tables available.
Gluten-free angle: NOT a dedicated frier, so passed on the fries. Got the carne asada barrio bowl. Rice, beans, carne asada, lettuce and shredded cheese. Said yes to the salsa too which complemented the meal nicely.
Agua de horchata was yummy too! Give them a try!