Ranging from 15.5 to 16.7 mph, you're on a par with me, and I'm good enough to ride all day. In other words, if you just want to do an MS 150, it sounds like you're on track to finish it okay. If you want to keep up with specific people, that's a different issue.
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"be careful this rando stuff is addictive and dan's the 'pusher'."