Is it not Winns when I think about it?
I agree a shot of Winns fuel injector cleaner every 6k plus of course use a good quality detergent fuel, not supermarket petrol, should keep lumpy running at bay.
OK but why? if u register with PetrolPrice.com u can receive a regular update on the cheapest petrol/fuel in your area. I bet if you did this you would find a premium fuel on sale at the same price!
Switched On Bear!!