I was thinking about getting a dirtbike and putting street tires, just to get around town easier. About how much gas do those use, and how fast do they normally go? Where is a website to find more information on it? I wouldn't like to spend much more than 600$ Are there other kinds of motorcycles that get better milage? What is a good website to buy used bikes from without getting ripped off or scammed with something that will break down?