Hey, you are doing fabulous for a "new" rider. I don't think you'll be dropped at 18 mph average. That's really great! Anyway, if it's like most organized ride, it's not a race, and you should ride your own ride and not worry what others are doing. You can usually follow the markers on the road that tell you where to turn. Make sure you hydrate and eat during the ride and you'll do great!
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"I never made "Who's Who"- but sure as hell I made "What's That??..."