Conversion to road bike

this is all what i would think, cause its a hard question to answer and i havnt read anything really about it...

if your averaging 14mph on that kind of terrain for 20 miles, i'd figure you would do about 16-18mph with a road bike on a moderatly flat road. im pretty sure the faster you go, air resistance increases exponentially so thats why its not gonna be a huge increase. though 4mph is a decent gain in speed.

best advice i can give is dont go out with your road bike and stair at your spedometer trying to go a certain speed the whole time. i actually like to ride without a cyclocomputer a lot of the time cause i dont feel as bad if im not going as fast as i think i should be. like if im going uphill with a headwind ill feel like i need to go faster since it says im only going 12mph, which ill end up killing myself up that hill and ruin the next part of the ride.

so i usually just ride with a hrm so i know how hard im working, and i know how far im going cus i clocked it in the car so when i get back ill see what my average speed was.