fuel brand to reduce WS pinging

[jeff_o]

I've searched the forums but everyone was just discussing about fuel economy.

I'd like to ask if anyone has discovered a particular fuel brand that would reduce/eliminate WS engine ping? I'm currently running Caltex Vortex 95octane but pings faintly audible on highway uphill runs. I've tried Shell 95 as well and it pings too.

Haven't tried BP 95 yet as they don't have a 4c discount docket :p