Greenergy supply Tesco 99 RON (now called Momentum). Quality certificates are here

http://www.greenergy.com/Buying/fuel_certificates.html

Bioethanol is used to increase the RON rating.

In my view nothing wrong with the fuel, I use it in my car which is now at 137k miles. Have used Tesco 99 almost exclusively since I got the car when it had done just 32k miles.

hey guys without sounding err obvious but all fuels are made up of crap ingredients, additives etc, and ALL fuels are refined to a level that is " considered acceptable ". we all know that theyre pretty much the same.... poor..... to say the least !!!! Just smile when your filling your tank with super and say to yourself "nothing lasts forever"