Todays best 10 gas stations with the cheapest prices near you, in san bernardino county, ca. The ladies who work the graveyard shift here are just some of the nicest ladies youd meet. Ampm, 4525 e jurupa st, ontario, ca 91761, 15 photos, mon open 24 hours, tue open 24 hours, wed open 24 hours, thu open 24 hours, fri open 24 hours, sat open 24 hours, sun open 24 hours. Ampm is a convenience store chain located in ontario, ca, known for its freshlybrewed coffee and quick meal options, including breakfast sandwiches made with cagefree eggs and allbeef jumbo hot dogs.