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Is it possible that My engine just operates better under a 60% load than a 40% load,*snip*
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It's not only possible, it's probable. (In fact the whole point of P&G is to keep engine load up in the efficient range while the engine is actually used.)
I suggest you look up the threads about BSFC-charts.
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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)