Troy asked: Do the same electric bicycle laws in Florida still apply if I use a gasoline motor as a generator to power the electric assist motor instead of a battery?
Your situation is not specifically addressed by the statute. Since the power is generated on the bike by a gas motor, I believe that it would not fit the statutory definition of bicycle.
s. 316.003 – Definitions
(2) Bicycle – Every vehicle propelled solely by human power, and every motorized bicycle propelled by a combination of human power and an electric helper motor capable of propelling the vehicle at a speed of not more than 20 miles per hour on level ground upon which a person may ride ….
You may want to check DMV procedure RS 68 that applies to gas motors on bicycles to see if it answers your question more definitively.