
I mostly want one to make travel around the city faster. My bicycle is great for most rides, but not all. I like the mileage that a lot of motorcycles seem to get (I pump gas, so sometimes i'll ask a motorcyclist how many miles he gets to the gallon), and the fact that it's NOT a car.
Is riding a motorcycle at all like riding a bicycle? I know that with the weight and speed of a motorcycle, there will be some very big differences, but I want to know if it's a completely different experience or not.
How much is insurance generally? Is it more or less than I would pay if I had a car?
How much should I put away for the first purchase? This includes safety gear. I plan on buying used if at all possible for the bike(Craigslist seems fulled up with 650cc+ bikes right now though).
I'm sure there are other questions that I should be asking but I can't think of any, so any other helpful information would be useful. I've got plenty of time to think of more. A few months, minimum.
Also, a bit about me: I'm 21 years old, never driven a car even once in my life. Unless of course you count this VW bus that was converted into a bicycle.

And since I know you guys all like pictures so much, i'll post pictures of my current ride(s), even though they're pedal powered.
http://nimmy.info/images/bike.jpg
http://nimmy.info/images/bike2.jpg