alvaro84 @ post #114 makes an excellent point. You need to distinguish bigger bikes from bigger engines.
Yes, a 100cc bike with a 47" wheelbase would be pretty cramped for a long ride, and a small engine is usually coupled with a physically small OEM chassis (at least for the street). Touring bikes often have a 58-62" wheelbase to give you room to move around and stretch out a bit.
So if you want a small high-mileage engine but wish to go long distances couple that engine with a chassis sized to give you long-distance comfort.
cheers,
Michael
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