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I think Mazda didn't bother because the EPA gain doesn't reflect the full potential of the system enough to warrant increasing unit costs... which makes sense when you're trying to sell cheap cars. (Don't ask me why they thought the expensive SkyActiv engines were worth it!)
I think most of us here already recognize the limitations of EPA test numbers... but the general public will see the relatively tiny EPA gain Mazda would've gotten with the system as some sort of proof of its worthlessness.
Perhaps newer systems with more powerful starter motors that also give a mild assist will make more of a difference.
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