I recently did 10 hilly miles for non-timed charity ride followed the next weekend by a relay triathlon where I only did the cycling part (9.3 very flat miles). I am new to cycling and these were my first two events. I currently ride a Trek Navigator Hybrid and on hilly rides average 10 mph and on flat 12.5 mph. I'm anxious for more distance and more speed, but am plus sized on a hybrid. What steps do I take to gain the greater speed and distance? Should I be averaging a higher speed before trying to move on to a road bike? Will a road bike even give me greater speed and more ease for longer distance. I would like to be able to do longer rides around 30 miles as my next step. Looking for any guidance anyone might have out there.