Again, if we look at a Canada Post site that has, say, 200 trucks in it, for fast-fill application, which is what we would need to refill that many trucks every night, it requires multiple compressors to compress the natural gas into a very tight space in a tank. The refuelling infrastructure for fast-filling of 200 Canada Post trucks would cost about three-quarters of a million dollars. Doing the same for propane would cost about $50,000 to $70,000. Propane doesn't require as many compressors to pack the fuel. Propane is a liquid when stored under light pressure, whereas natural gas is a compressed gas, so it's harder to pack into a tank.
