Plus, I do think that the "afterburn" is true (even though the article said otherwise). I eat 3000-4000 calories a day (depending on the intensity of the workout) and I'm still losing weight. As my workouts are only 10-15 minutes a day, I can't be burning all of that during the workout.
100 Pullups - 5 minutes
1 Mile run - 6:15
I can lift 200 lbs over my head
I could go on but people already view CrossFit cultish, so I'll quit before you think I'm TOO crazy.
Anyway, Crossfit is the only way to go. It's a great workout, and it's especially great if you can go to a Crossfit gym. Having people around you pushing you makes you go even harder and get into even better shape. I did Crossfit on my own for a while, and saw lots of improvements in my fitness compared to the normal gym rat stuff I did. Then I joined a Crossfit gym and I saw another round of gains. I can honestly say I'm in the best shape of my life right now, and I only workout for 10-20 minutes a day.
The torque required to turn an alternator is the sum of some constant value related to the mechanical friction plus a variable term that proportional to the current (really power) draw on the alternator.
Also remember you have a battery in a car that can buffer quick changes in power need. That is, you have a low power alternator constantly filling the battery and when the power steering needs lots of current it takes it from the battery. With proper sizing of the alternator and battery, you could get this to work really well.