You do not want to use motor oil that has friction modifiers in it. This engine runs the engine/transmission and clutch in the same oil. Honda makes an oil to their specs. I usually run 15w40 Rotella in my Honda and Yamaha 4 strokes.
60 mpg is not bad for commuting. Have you had a chance to take it out on the road?
One area that I didn't see mentioned is a valve adjustment. Also maintaining lubrication on the chain is also important. When you have to change chain and sprockets add a tooth to the countershaft sprocket.
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