Uh, maybe because he needed to be someplace and couldn't afford another two hours of charging time? Maybe because there were others waiting in line for the only charger available for miles? Maybe because young urban punks were threatening those waiting for a charge?
When was the last time it took you two hours to pour 20 gallons of liquid fuel into your tank?
Given that my TDIs only hold ~16 gal, it'd take a couple of hours to drop a full tank low enough to install the remaining 4 gallons.