I completely blew this calculation.
Revision in process.
1.5 MWh is 1500 kWh (or a constant net output of about 2 kW over the 768 hours of the experiment). Using the same conversion factor of 33.41 kWh/gal, this is equivalent to 45 gallons of gasoline, or 1,300 miles at 30 mpg..
Still, a remarkable amount of energy from 1 gram of material, but not the ridiculous amount I originally calculated. My apologies.
I think by at least three decimal places. A 1.5MW generator burns about 100 gallons an hour. Considering it is about 30% efficient that works out to 30 gallons of diesel fuel.
IOW over a period of 30 days this thing generates at about 2.1kW