is it time for winter blend gas yet?

My gas mileage the last 2 tanks has dropped noticably. With less use of A/C and not having to run defrost or floor at all, i expected to improve slightly, not decrease. Anyone else notice a change in the Missouri/Kansas areas?
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Can't speak for MO, but have noticed a slight dip in mileage here. Now that the colder temps are upon us, I'll bet they've already started formulating winter gas. God knows since it all comes out of the same pipelines, it's probably in many of our tanks in the snow belt already. :irate:

i just learned of the different formulas recently. what is the difference?

i just learned of the different formulas recently. what is the difference?
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In cold weather climates, higher concentrations of ethanol and other additives are blended in to keep the fuel from freezing.

Higher ethanol concentrations = lower BTUs = reduced mileage.

I don't believe your formulation will change with the season in Louisiana.

I also assume winter blend gasoline is in our tanks recently. I purchased my car in June so most of the miles I put on the car were in warmer weather and I had much better gas mileage. I usually get over 400 miles to each tank, but I recently refueled at 365. I'm due for my second oil change as well, if that helps. It's a 2006 Mazda 6i Sport with 6200 miles now.