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Well if you were, say, using 15hp on the highway 2.5hp would be 17% of that. After some efficiency loss due to decreased load you'd be expecting to save about 11% fuel.
But the power saved might be less that 2.5hp at lower revs.
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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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