have you experimented with sprockets? Since these engines rev so high....
I went to a 15T sprocket on my ninja 250 and picked up 3-4mpg on my trips. Lowered it about 1000rpm going from the stock tires to the MT75 tires with a 15T sprocket. MT75 tires are more sticky though, so i'd assume more rolling resistance. Those stock dunflops are harder than rocks, so less, i'm assuming you're rocking the stock flops?
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