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From what I saw it was basically that no one was willing to try doing the Atkinson style cam swap due to suspicions of reliability an actual effectiveness. I think for my application I would be better off with a normal style cam designed to run in my specific rpm range. Reason being, I saw a few stated claims that the Atkinson design was only 10-15% more efficient which would put me from 18hwy to 20hwy and reduce power output very noticeably. That seems like an absolutely terrible trade-off for the amount of FE gained. I would still like to see some actual hard evidence from someone that has tried it though, I'm just not willing to be the guinea pig in this situation.
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