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Some of the smaller bikes are offering a 6-speed trans. Bikes with 125 to 150cc are not as common as 250cc machines. See the latest Vetter Challenge results where 'low&slow' topped 175 mpg on his streamlined 250cc Ninja. A 150 cc at 3000 rpm and a 50cc at 9000 rpm are moving the same amount of A/F mixture. Key factors in fuel efficiency are compression ratio and air drag.
Rider comfort is a persistent problem. The individual's settings of handlebar height and reach are a function of arm and torso dimensions. Build the bike to fit you. Once you have your body position optimized your shoulder height will determine the vertical dimension of your fairing. Max width is at the shoulders so the cross section would be an inverted egg shape. Vetter just updated his fairing tail section see Chapter 83 at craigvetter.com
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