Folks looking at different options for alternatively fueled vehicles are apparently increasingly considering moving to propane Autogas. Propane is currently the third most popular engine fuel (after diesel and gasoline) and given the changes in our domestic energy production, namely increases in Natural Gas and Crude Oil production/refining, propane is looking like an increasingly good choice.
Because Propane is produced as a byproduct of both crude oil refining and natural gas processing. It stands to reason that as domestic production of the products we produce propane from goes up (nat gas and crude oil), propane will likely be an increasingly economical choice on top of the environmentally sound reasons already present.
Propane is actually one of the cleanest burning fossil fuels, and is considered an alternative fuel. Propane autogas vehicles are efficient, low emission vehicles. Additionally, propane has a higher octane rating than gasoline, and burns cleaner which leads to lower maintenance costs over time. There is also decent public access to propane fueling as opposed to other alternatively fueled vehicles like CNG/LNG vehicles.
I wrote an article for the June Issue of Oil & Energy Magazine regarding what I think is the positive outlook for the future of Propane Autogas. You can read the article by clicking here: http://www.nefi.com/oilandenergy/archive/OE_0613_web/#36