My 09' Platinum's gas mileage has went from 18.5 on the highway to 14.5 or the last 2 months. City mileage is down to 11 MPG. Has anyone else experienced this and if so what did you do to correct it. No, my foot is not in it and the truck is stock with just 13000 on the ODM.

 

Dang, did you change tires or anything like that. That's a huge difference.

 

Mine has taken a dive lately as well, but I've chalked it up to very cold weather, more 4x4 use (lots of snow), and short trips.

 

shorter trip, winter blend gas. leting it idle longer to warm up. all add to less mpg

 

^
x2.

- NCSU

 

Tires are OEM, This is pure driving. I thought winter blend gas, as winter blend is designed to give you more HP.

I fill up in Lawton, OK and drive directly to Manhattan, KS and it is just awful. I changed air filter, oil trying to improve it and nothing seems to help.

I sure hope it is the winter blend, but my wife Infiniti is not affected. Wonder if I should take it in?

 

did you check tire press?

 

all fluids, air cleaner check out

 

Are you going from the truck computer display, or is this hand calculated MPG?

 

hand calculated

 

That's pretty low.

The higher trim levels do seem to burn more fuel. I could understand that in the city due to the weight of extra options but the impact of a few extra pounds on hwy mpg should be minimal. Does anyone know if Ford loads different calibrations into the higher trim levels? Maybe to make it shift differently or downshift sooner to make it seem more powerful? Of course even a different shift program shouldn't affect freeway mpg unless you were hauling/towing in the mountains. Is it staying in overdrive?

I would have to work at it to get my 2010 XLT SC 4x4 w/4.6L 3V below 20 mpg on the highway (hand calculated).

 

I drove to Kentucky from Kansas on a tank of gas in the summer, averaging 18.8 MPG. Since, Thanksgiving is when I noticed the change. My 2004 that I just got rid of, was not affected and always averaged 16 MPG.

 

It's possible you have a little bit of sealant or something caught in your thermostat. That could make your engine run too cool. You could experiment with blocking the airflow through your grill to see if that helps. I noticed just about every truck in Wisconsin and North Dakota had sealed grills when I was through during the cold weather last month. That is a good idea on the F-150 which does not have a well insulated/sealed engine bay.

 

interesting theory.

 

It's just winter, when I picked up my truck new this time last year best I could get was 13 to 14. Now over summer I was in the 18 to 19 range. Now I'm in at 16 to 17 at best