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Are you sure the grip muffs are to blame and not the colder temps with the winter blend of fuel, thicker grease and oil, etc.? A friend and I have nearly identical F650 GS dakars. She has easy access to 100% gas, I throw in whatever fuel is available = up to 10% ethanol. When she has pure gas and I have ethonol blend we see an 8-10% difference in FE. Obviously the 100% gas getting the beter mpg.
For a Vetter challenge bike, I have liked the Ninja 250 for years because it is available, cheap. I started with a CB250 while my girl friend rode a rebel 250 as the control, but I found, like Alan Smith, the air cooled motor and 5 speed would be going down the wrong path. Suzuki TU250 fuel injected might be good, but if I see a CBR250R, dropped but not bent for cheap, I would have to scoop one up.
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