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Will you carry one person or two? Fuel injection is more consistent and doesn't have the cold weather issues that are common with carbs. But you have to get into a newer bike to get it. I don't think the K75 will make it to 90 mpgUS with streamlining. The engine is too big. You will be operating it at small throttle openings which are far from the efficiency range. The G 650 GS is a lower power single and can do great numbers. One person here gets 70's with stock body work. The CBR250R is about the best starting point if you want to build a solo streamliner. It has the perfect power of 22hp and much lower rpm stroke and cams than a used Ninja250 which is the cheapest place to start. For a two up machine, The new Honda CTX700/ NC700 has one of the worlds most fuel efficient motorcycle engines that makes a plentiful 48hp. Stock bikes ridden normally are getting 68 mpgUS from the ultra long stroke, 6,500 rpm redline engine. This is only 2 mpg less than the CBR250R. The Ninja650 can be surprisingly efficient at low rpm's with a long gearing change despite it's 68hp peak.
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