Are you sure, I remember the exact opposite.. Tesco 99 is pretty inconsistent, sometimes its great, other times its pretty poor.. V-Power you know what your getting every time..
....That's how I know it too and I've just checked with Revo themselves for clarification : -
Their first recommendation is V-Power, followed by BP Ultimate. They know that some people report good results with Tesco 99 but currently they don't highly rate its consistency. Once upon a time, back in the day, Shell Optimax was inconsistent.
That's from the horse's mouth, Teutonic_Tamer, so I just don't see where you get your info from.