Well it depends sa kotse kung saan siya hiyang.

For example, my Vios hates Petron Xtra Unleaded (91 RON) When I used that, I got the worst mileage and the worst performance. So I used Petron XCS (95 RON) which was okay. After some time I switched to Shell Fuelsave (91 RON) -- I got better mileage and at par performance when I was still using XCS. So not only did I save money without compromising performance by switching to FS, but I also saved on mileage.

You can try out other products. Then see from there which fits your vehicle quite well