A friend of mine bought GLI 2013 model and Toyota's mechanic pour Petron 20/50 in the car and also he bought Guard filters (oil & air). His job is to drive car 5 times from Lahore to Islamabad in a week. And his car was giving average 12.3 on motor way.
He drove 15K in less than 3 months and I told him that toyota's mechanic has given him the worst ever suggestion about the oil.
On my suggestion, he changed to PTT Performa 0/40 and also tried ZIC XQ. Both with Leepon's filters.
Guess what? His car is now doing 15.5 on motorway with A/C. And I can feel his happiness in discussion whenever I spoke to him in this regard. He seem more then happy.
Cheers.