“Unlike petrol prices, retail diesel prices are unregulated in South Africa. Only the wholesale price at which suppliers may sell to stations is fixed by the government.”
I thought both diesel and petrol prices were regulated in SA so this was news to me (I don’t drive a diesel car). With the price increases coming, anything to improve competitiveness between suppliers is going to be good for consumers.
The linked article discusses the use of MyTank and Pitstops apps for this purpose. I actually use the Fuelio app already to track all my fill ups, and it also crowdsources the prices.
But either way, all the apps really rely on the users who input the prices, so the most used one in the country is probably going to provide the better value.