If your car is factory and not modded, it is most certainly not pinging, knocking and certainly not for an extended, daily period of time. You might have loose engine mounts or something minor like that, but pinging is very serious and I HIGHLY doubt it. A Factory car will not have issues just because of the compression ratio or fuel it uses, it will only encounter these kinds of issues generally if you mess around with it (i.e. start heavily modding it). Not even an exhaust or air filter should do this to a modern engine. Pinging is a serious issue and only occurs when you really start playing with engine timing via computer chips and start playing with fuel quality. Just mention it at your service and tell them the exact symptoms, they can start from there.
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2012 Mazda3 MPS 
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