2013 Eco Boost F-150 Fuel Mileage Drop

[P93suafilo]

When I first bought my truck in the early summer I was getting about 16.3 mpg then I changed out some bad O2 sensors and my mileage jumped to 16.7 mpg. I thought great the more standard maintenance I do the higher I will get, being I don't have a lead foot. Last month I decided to do some more and did the spark plugs, air filter, and oil. I expected my fuel mileage to jump after doing that but now its taking all I got to keep 16 mpg and on the highway its even worse. I did everything to spec and I am wondering why would my fuel mileage drop?

 

[Snoranger]

Winter blend fuel?

 

[P93suafilo]

That could be it! We did have some cold fronts roll through right after.

 

[sgtsandman]

Winter blend fuel is what comes to mind for me as well. I noticed the drop as soon as they did the switch on my trucks.

 

[adsm08]

I third the motion. As soon as I saw it happened in the last month it was my first thought.

I usually don't bother to track my MPG from Nov 1 through May 1 because the fuel blend and temps in those months just make it useless.