The 650 class is the often misunderstood segment that fits between the 250's and the supersport 600's and includes all of the more versatile everyday riding motorcyles. I just bought an 2007 Ninja650 to go with my 2011 Honda CBR250R and 2009 Ninja250. It has 8,800 miles and was $3500 with fresh oil change and tires. My son will be riding it mostly as he is a little too big for another Honda at 6'1, 280lbs. I'm sure I will have a chance to put a couple tanks through it where I should be able to get about 55 mpgUS on my 68 mph commute. The Ninja 250 gets 66 (my daughter rides that now) and I am just over 90 mpgUS on the CBR250R. The Suzuki SV650 and the Ninja 650 are the go to used motorcycles for commuters that are too big for the new Honda CBR250R. Much better on gas than any inline 4 engine in a 600 that all the canyon racers ride. But you can't buy a new SV as Suzuki has dropped them in favor of the V-Strom. The BMW G650 GS costs $7900 and the newest Honda NC700 at $7000 can get amazing fuel economy at 72 mpgUS. They are tall riding adventure style bikes like the Versys and the V Strom but could be lowered. Tall riders that occasionally ride on dirt roads and less often on the big highway might be interested in the KLR650.
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2012 NC700X Overview - Honda Powersports
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2012 Ninja® 650 Sport - Kawasaki.com
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2012 Versys® Sport - Kawasaki.com
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Suzuki Cycles - Product Lines - Cycles - Products - V-Strom 650 - 2012 - DL650A
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BMW Motorrad USA