Genifuel is producing renewable natural gas, which can be directly compressed into Compressed Natural Gas (CNG) and is already used as a motor fuel.  CNG is an excellent fuel, since it burns cleanly and produces the lowest greenhouse gases of any motor fuel.  Engines designed for CNG run more efficiently than gasoline (petrol) engines because higher compression ratios are possible. 

Another motor fuel option is to convert methane from natural gas into a chemical form known as dimethyl ether (DME).  DME is the simplest of all ethers, and because it has no carbon-carbon bonds, it burns very cleanly.  Also, since it is a longer-chain molecule than methane, it is easy to liquefy, and will remain liquid under reasonable pressures (five atmospheres).  Its characteristics are similar to liquified petroleum gas (LPG), which is widely and safely used. 

DME is an excellent fuel for diesel engines, and can be used in existing engines with only minor modification.  DME burns cleanly, has high cetane, makes no soot, produces no "diesel" odor, produces low NOx, and has no sulfur.  Follow these links for more information: