The car was dumped shortly afterwards less than 4km away in Hedley Pl in Raumanga
"Staff at the superette were uninjured but highly traumatised," the spokesperson said.
Police are appealing to the public for sightings of the silver 2003 Mazda Atenza on the day of the robbery.
"Police are keen to speak to anyone who may have seen this silver Mazda Atenza in the Maunu area during the day of the robbery or anywhere between the Maunu Superette and Hedley Place after the robbery."