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[Tommy_Gun]

Quote: Originally Posted by dietcokeplease

I don't think that Tesco have confirmed that additives and detergents are present in the 99RON fuel, so I'm steering clear of it.

The only cars that I fuel at supermarkets are hire cars.

http://www.greenergy.com/products/99_octane.html

"Greenergy supplies the new 99 Octane Super Unleaded petrol now on sale at selected Tesco forecourts. This performance fuel has the highest octane rating (RON) of any petrol currently on sale at UK forecourt chains and contains an enhanced additive package to help remove engine deposits and ensure smooth engine running.

The fuel contains a specially formulated mix of high quality petrol components, carefully blended to achieve 99 Octane. These typically include 5% bioethanol, a renewable but also high-octane product."