don't forget gasoline blend changes in some locale when the season changes. E85 really does a number on my Prius. I go from just over 50MPG then as soon as the gas pump starts pumping E85 into my Prius, MPG goes down into the low 40's. It shouldn't be that bad but it is!! I don't think engine computer in my Prius like the E85. How else can I explain such a huge drop off.
Let's just say that ethanol doesn't provide any power then for each gallon I still have .85 gallon of gasoline. so my MPG should only be down to 85% of my summer driving. But it isn't. It's far less. And I have driven without changing my habit just to see. no heating nor AC and it still is worse than 85% of my summer MPG.
Only thing I can think of is that Prius engine computer doesn't like E85...
So is E85 really help with SMOG and air pollution?? Has anyone really looked into it?
I'm not so sure about E85.