Yup, the CS is the fuel injected, belt driven incarnation of the F650 line. GS' are also fuel injected, but chain driven. Classic/ST models (before 2000) are carbureted.
Interesting that the new G650GS has the same engine, but the new F650GS' are 800cc twins... they have good FE for their displacements too, anyway, but probably worse than their 650cc singles (it would be nice to try one).
And yes, I do hypermile.
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