In our town premium petrol prices are as follows 12/6/18 ( rounded off to the nearest $ for simplicity ) :- Shell E98.....…$180. Woolworths E95....$168. Mobil ( aka. Exon, Esso, 7-UP ) a new service station started up here on the Queen's birthday weekend. Supreme E98….$1.58. How do I know that it is Supreme E98 that I am getting and not E10....as a lot of these service stations have been mixing and matching of late and adding other so called ingredients and they are not tested by the authorities any more. I know that this a gimmick for a new service station to suck you in....I wonder will the difference still apply when petrol returns to normal!