Go oop to the max...It worth its weight in gold.
It can be expensive in some areas. Been lucky I get mine at 77.7p per litre.
In a week, 28.95 litres of optimax has done me 205 miles. U know gti pulls away quicker, with optimax it goes wilder.
I was a doubting thomas when it was first promoted but sampled it on MK2 CL then and it made me smile. Now giggle when overtaking in my gti. Numerous motorists have confirmed its benefits so I do believe it works.