The United States Department of Energy (DOE) reported in January 2017 that based on data from selected dates between 2000 and 2016, two fuels stand out for their low price variability – Compressed Natural Gas (CNG) and electricity.
The DOE states: “Retail prices for most transportation fuels have been highly volatile over the past 16 years. The prices are displayed in gasoline-gallon equivalents (GGE) which equate the energy content of any motor fuel to that of a gallon of gasoline. The prices are collected in gallons (except for CNG and electricity) and are converted to GGE. In this figure, the prices were also adjusted for inflation to 2016 dollars.” Read more »