Maybe I'm reading the charts wrong, but @2100rpm there was 30%(?) increase in power with 6% improvement in BSFC, which means 23% more fuel was injected. It's not apples to apples and if you don't isolate your variables - you are not doing science!
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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)