it's true that a lot of other manufacturers engines perform differntly with different grade fuel.
I have a magazine which tried different RON types with different cars:
mk2 Golf
Renault 'ouef du chien'
Vauxhall whatever
and a
Ford
I think the Vauxhall and the Renault had miles better performance figures when on 98 - 110 RON when compared to running on 95 octane.
The VW had a slight performance boost.
Make up your minds about build quality of engines then . . . . .
