I did actually calculate out the CO2 output equivalency of riding a bike is actually about 90 MPG for the average American on the average diet. I doubt that much of what they do to get this kind of mileage can ever have practical use though. I'd be more interested in a practical vehicle that got 100 mpg.
Plus I think I'm a little annoyed that this article made Slashdot because vehicles and numbers like this have been around for years, and I find nothing particularly impressive about this particular one.
I check my weight fairly frequently, not that it has been out of the same 5 pound range for the last 3 years since I lost 5 pounds (not something I was trying to do) while traveling/living in South America for a 6 months. I think that may have come from climbing mountains. Not that you probably have time or the physical conditions to climb mountains, but if you do go up to fairly high altitude, maybe 12 thousand feet or higher, you will lose your appetite while you are there. When I was climbing mountains, I ate maybe 500-1000 calories in a day, and that was somewhat forced. Parents should monitor their children's weight too, it's no good letting a child get fat before they can take responsibility for themselves.
If you are always hungry when you diet anyway, you could try fasting for a week or 2, I've heard (though I've never done it myself for more than a day) that hunger goes away after 3-4 days as long as you aren't eating anything, though it comes back as soon as you do eat something.