Perhaps TeleMad you were referring to: "methane which is better for the environment"?
Obviously I meant as a fuel. Burning a mole of it produces 4 moles of water, only one mole of CO2. Next best thing to hydrogen as a fuel but less troublesome.
Over here methane and LPG have both been in use as alternative motor fuel for decades. It used to be done only by private people, just for the saving, with a switch between the gas and gasoline. More recently methane has become the issue because it pollutes less and some townships began to have fleet vehicles running on it with their sides painted to advertize: "I'm not polluting the air!". People appreciate it. Vehicles running on methane are incentivated, including exemption from the traffic limitations that unsue when pollution goes over certain limits.
I have heard that manufacturers are now selling cars with bi-power engines, being designed for it they don't run less well on methane.
I gave Uncle Al's links a quick look and I saw a few amusing things, including ethanol being referred to as a low-grade auto fuel.
When I was young I knew a Canadian engineer, graduate from one of the most respected faculties in Canada, and I remember him telling me about the early days of automobiles. He said that, when the time came for manufacturers to put them in production and for widespread distribution of fuel, the choice came to be made between the two best candidates for fuel: gasoline or ethanol? They all agreed on this line: Oh, heck, you drill a hole down in Texas and petroleum comes gushing up for free! Refine it a smidgen and you're off! Short sighted, short sighted.
