 Dr. Scott Kaplan from the U.S. Naval Academy and Dr. David Zilberman from UC Berkeley led the research. They found that adopting E15 could save California consumers approximately 20 cents per gallon compared to the currently available E10, which contains only 10% ethanol. Given California's annual fuel consumption of about 13.5 billion gallons, that number translates to an astounding $2.7 billion in potential savings per year.