I ended up purchasing a 2010 Ford F150 supercrew 4x4 which had been converted to run on CNG and gasoline. This is called a "bifuel conversion" in that it runs on both gasoline and CNG as opposed to a "dedicated CNG" which is CNG only. Encana is an oil and gas production company which has been active in the Haynesville Shale, especially in the Red River Parish area. This truck had been an Encana fleet vehicle.