[bitshiftfaced]

Probably part of it is that gas stations must store gas in underground tanks, which can pose an environmental hazard. Topside leaks from faulty valves, hoses, nozzles, and human error can also cause an environmental hazards.

There's also a matter of accuracy in how much fuel you receive and how much you pay for. I'm assuming it's much easier for an elective vehicle to independently verify how much of a charge they received compared to a gas car.