Selling Natural Gas Powered Cars

That's what the Wall St Journal was doing yesterday.   They mentioned lightly the major problem with the idea, namely the size of the gas tank.  Compressed natural gas (CNG) is less energy dense than gasoline, so the tank will have to be bigger, a lot bigger.  Imagine a 55 gallon oil drum.  And this is holding pressurized gas so the tank has to be a cylinder, none of those tricky shapes that fit into odd nooks and crannies.   I suppose the stylists will be able to do something, but I'm betting a CNG powered car will look odd, with that big cylindrical tank sticking out somewhere.