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In response to the original question, an Arion Lightning comes very close to hitting those parameters. 120 kt+ crusie, 5.5gph with the Jabiru...

If you used a 2 X 2 twill 6K carbon, three plies would get you right around .065. But is the tube you had just a hand laid laminate, or was it also vacuum bagged? How smooth is the surface, and is it...

My goodness, I wouldn't advise learning from the Corvette guys! Maybe they've improved over the years, but my experience with them is they're a bunch of tiger hair throwin' bondo butchers.
I'm not...