We ALWAYS use Premium (95) in the T4 Transporter and the Golf CL (1.8L single point injection). We did an experiment with Shell 98 but found no added benifit around town. I believe it will be better on a l o n g run.
When we bought a Mk 3 Golf new in 95, I used 2 tanks of 91 RON, 1 tank was the worst fuel economy I got with the car in 2 years of ownership.
(5 & 98 RON have more detergents in the fuel to help keep the injectors clean (much cheaper than injector cleaner), fuel also burns at a higher temperature keeping the inside of the cylinders cleaner.
I hope this helps.
Maris
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