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Neutral should beat DFCO hands down.
That valve is likely used as a white smoke limiter, it raises combustion temperature which helps complete burn and accelerates warm up.
I would suggest starting with some kind of indicator that tells you when it is activated.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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