Uh, Is this guy completely clueless or what? Mopeds emit more VOC's and particulate matter (carbon, sulphur, etc) than any car truck or SUV on the planet. One moped emits the same pollutants as 20-30 late model cars OR 8-12 SUV's. Don't ask for the details. Check out the EPA's website and see for yourself. I bought a moped a few years ago thinking it was an environmentally conscious thing to do and I would save on gas. It turned out that my moped got only 65 mpg (the same as a 2000 lb Honda Insight) and it was later brought to my attention that it's the biggest polluting device you could own (legally). I also had to toss $9 worth of oil (burned up in the atmosphere) for every 8 gallons of gas (about 500 miles). The operating cost of my moped, in terms of gas and oil, was the same as my Mazda!
And about those claims of mpg from the manufacturers (100-150 mpg), where in the world do they come up with this stuff? I could probably get the equivalent of 150 mpg if I rode my moped off a cliff.
My advice - save the planet, by a car.