By Michael Bates, NGT News.

Late last week, the U.S. Senate passed the National Defense Authorization Act (NDAA) for fiscal-year 2015, which contains a provision addressing a disparity in the federal Corporate Average Fuel Economy (CAFE) program that has been disadvantageous to most bi-fuel alternative fuel vehicles.

Existing regulations allow OEMs to earn CAFE compliance credits by producing bi-fuel vehicles (also referred to as "flex fuel" or "dual fuel" by some automakers), subject to a cap in the number of credits an OEM can receive for given vehicle models.