Using a junkyard instrument cluster from a 2015 Mazda6, I inferred the meaning of bits in CAN messages on a Mazda SkyActiv vehicle. I then repeated the same experiment with a 2014 Mazda3.
I've made available what I've learned here.
The CANbus messages appear to change between generations of vehicles, as the web's most popular resource for Mazda CAN Bus messages documents a format that is noteably different.
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