Apart from the pricing issue, winter-grade gasoline does yield slightly less energy than the summer blend, Mark, but only by about 1.7 percent on average, according to the EPA. Ethanol's impact is far greater, dropping energy content — and fuel mileage — by more like 30 percent. Still, winter-blend gas imposes its minimal loss on every gallon your engine burns, whereas E10 is a blend of 90 percent gasoline and only 10 percent ethanol, which mitigates ethanol's mileage-lowering quality.
http://articles.mcall.com/2013-03-0...com/2013-03-07/news/mc-gas-formula-mpg-20130307_1_more-gas-mileage-gas-stations
Now that the colder weather has hit the south, my mpg has begun to suffer. It has gone from 18+ to 16+ for suburban/highway driving.
http://articles.mcall.com/2013-03-0...com/2013-03-07/news/mc-gas-formula-mpg-20130307_1_more-gas-mileage-gas-stations
Now that the colder weather has hit the south, my mpg has begun to suffer. It has gone from 18+ to 16+ for suburban/highway driving.
