Hi all. I have a 2012 Mazda 3 Skyactiv. I noticed this past summer I was consistently getting 525 or more miles per tank no problem with almost 50-75 or more to go in the tank. Now, I'm barely getting 480 on the tank with about 50-60 miles to go. Is there a winter gasoline blend that gets less miles per gallon that we are being sold versus the summer blend? Thanks.