The Energy Needed to Power Godzilla!

Godzilla 2000 PosterGodzilla at his largest so far has been officially given to be approximately 100 meters tall at 60,000 tons (5.44*10^7 kilograms).  Using a simple equation based on Kleiber's Law which relates to the caloric requirements of terrestrial organisms:

Calories per day=K^.75*(bodyweight in kilograms)

Where K is a constant derived from the family of organism whose caloric requirements we are deriving.  For example, if we were to work out the caloric requirements of a 180 pound human based on this equation, we would use the constant K=72 for placental mammals.  The results would be

72^.75*180lb*.45kg/lb=2002 Calories

NEXT
Godzilla Picks Up A Train With His Mouth
Which is remarkably accurate, give or take based on the individual's levels of activity.  The problem here lies in choosing a relevant K value for Godzilla.  His appearance and origin are both strictly saurian, however it is currently unknown what level of caloric input was required for dinosaurs to survive.  We currently recognize that dinosaurs were not cold-blooded like the reptiles of today, however it is probably not accurate to model them after earths modern mammals.  For the purposes of this report, we will assume that his body structure works most similar to large reptiles such as Egyptian Crocodiles or Komodo Dragons with a K value of 10.  However it must be recognized that this will result in an extremely underestimated answer.

10^.75*5.44*10^7 = 3.05*10^8 Calories per day

Godzilla 1985This is a huge caloric requirement.  Blue Whales, the largest creatures currently thought to have existed, are estimated to only have a caloric requirement of three million Calories per day.  The official explanation for Godzilla's survival is that an internal nuclear reactor supplies him with all of the energy he needs.  However, we could also find out what this would mean if it were in units of commonly found foods.  Taking a big mac to be 550 calories, Godzilla would require 554545 to sustain himself.  Taking an elephant to be 6*10^6  calories, 51 of the great pachyderms would need to march themselves down his gullet every single day.  Taking an 180 lb person, and assuming that not only does his muscular structure compose of 30% of their weight, but that a pound of their flesh is composed of an average of 2100 calories, than Godzilla would need to eat 1153 people per day.   Good thing he's powered by soft science!