Source: The Detroit News
quote: Until the ULSD standards were put in place on diesel, it used to be cheaper per gallon than low grade gasoline.
quote: Diesel and gasoline are commodities. When demand is high and supply low, prices rise. When demand is low and supply is high, prices fall.
quote: The fuel companies simply know that most gasoline vehicle owners can just scale back their driving as prices go up, where most diesels are commercial vehicles which need to be rolling to make money. Diesel drivers as a whole thus are less capable of "voting with their wallet".