First I was referring to both premium and regular fuels both containing 10% ethanol. Fuels (both regular and premium) containing 10% ethanol have about 3.3% less energy (BTU’s) than fuels without ethanol. You can lookup the BTU energy contend on both types of fuel on the internet. By the way premium fuel contains the same energy content as does regular fuel. So you should see only a 3.3% mileage increase using ethanol free fuel - not 23%. If you are seeing a 23% increase you are somehow creating extra energy and you should patent your process.
