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Great thread, with great perspective, sadly to go out.
My two cents, as car tuner. Going to Atkinson cycle could be achieve without special cams. Look for Europeans with DOHC (double overhead camshafts), maximum compression ratio. When with adjusted intake camshaft timing (2-3 teeth on crankshaft pulley) and with less Ron gas like 92 instead of 98, you will get Atkinson cycle. It was tested accidentally on my past car, fitted different camshaft, was looking for correct timing. It had lost some of top rpm power, but got better mpg (don't remember exact figures, but it was noticeable, it was more about power those days, not economy)
It would be simple Diy mod. But remember - only to adjust intake camshaft timing.
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