A $500 scooter? Im basing it on an actual motorcycle that can get on the highway without me getting run off the road for going 40mph. If that was an option I'd just get on my mountain bike and ride that instead.
Motorcycles get better mileage but the high maintenance costs far outweigh the gas savings. And that's not even including the initial purchase price of the motorcycle.
Not if you get the right motorcycle. $2000 used Ninja 250, SV650 or the like are all highway-capable motorcycles that are boring reliable and get great mileage. Yes, you have to replace your tires more often than a car, but if you're truly using it as a commuter, you can get 20k-30k rubber. Chain & sprockets every 20-30k as well, oil change every 5k...on average, motorcycles do cost more to maintain, but there are always exceptions.
Besides, the higher maintenance costs are usually made up for by the much lower insurance costs.
For me:
Thermostat on 80 in the summer, 65 in the winter when I'm at home, switching to 95/50 when I'm not at home (I don't want to turn it off completely so that the pipes won't freeze and the paint won't peel).
All CFLs, keep things turned off when I'm not using them.
Internet & Cable & Netflix = $65/mo, would be cheaper but Comcast is jerks.
Cellphone, no landline = $30/mo
Washer always uses cold water.
Only eat out a few times a month.
Every few weeks, I get together with a group of my friends, and everyone brings some food. Usually there will be some kind of theme to stretch our cooking skills. It's a fun social event that's LIKE eating out, but much cheaper.
Brew my own beer+wine. Hard to say if it saves money since you start drinking more.
Grow basil. Ridiculously easy to grow, and making pesto is EXTREMELY fast and easy. Probably faster than driving to McDonald's and back, and much cheaper and healthier.
Live close enough to work to walk there (no car), live close enough to a park to run there (no gym membership). Also, it's not in the best neighborhood (cheap mortgage).
Do all of my own work on the house.