Winter fuel changeover detected?

[brucepick]

I filled up today, atnthenstart of my commute. I suspect my supplier has shifted over to the winter fuel blend. In spite of the fact that today's weather was warmer than recent days, my Scangauge about a 5% drop in mpg from what I expected.

Bummer.

[ksa8907]

Im not sure. It's been so windy here lately my mileage has dropped but i dont know if its just wind or other factors. I also added a grille block at the start of a tank so...

[brucepick]

I did very well this morning. I suspect yesterday's low numbers were due to circumstances - possibly a headwind. I didn't check for that yesterday.

So, I might still be on a summer fuel blend.