well, given you P&G the **** out of it and, if I remember correctly, drive quite slow, (pretty much the contrary of what I do) I believe the GN is a better horse FE wise than the GV.
It is relevant with the fact the GN is A/ a single, B/ less powerful and C/ a Suzuki (which as everybody knows is the best brand).
(that is french bike rider humor by the way)
That being said, I stick with the statement that a factory exhaust or at least a proper exhaust is gonna return more MPG because it gives the bike more torque before the peak torque, allowing to use a higher gear for a given hill and to stay in a constant throttle position uphill which is the key to hypermilling a bike P&G appart.
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