ThreeOhTwo

It's a combination of the gasoline and the cold weather itself. Winter blend gasoline has about 2% less energy per unit volume than summer blend gasoline. This is because gasoline needs to be more volatile to reliably start an engine in cold weather, and the higher-volatility gasoline has slightly less energy density than lower-volatility gasoline. Also, cold engines and transmissions are not as efficient as warmed-up ones.

CDC5.0

Almost 11,000km on my 5.0 and have had no issues other then a faulty O2 sensor that the dealership replaced without question. Great truck so far

steve392

kinda figured that, but not really a concern. Im still getting better mpg's now then with my 98 with the 4.6l. Plus with the HP that this truck has its to much fun mashing the pedal. lol

byoungblood

The air is also denser, thus the computer must add more fuel to keep the engine from running lean.

ClaySlayer

true given identical throttle input but if it adds more fuel effectively making more power then you won't push the pedal as hard so it's canceled out.

2010_rmk

2011 xlt 5.0 16,000 miles excellent motor !! Not one issue , had a 5.3 chev before this and I am impressed with the power of the 5.0.

PawPaw

No other issues since the O2 sensor and 4 injector's changed at about 3K miles. Truck has 15K miles now and got 18.4 mpg on a 250 mile trip yesterday, so I'm satisfied.

HankHill

Ok now what to do? After 5 days and about 500 miles, the CEL light is gone. Do I still take it in? I know the code should be stored in memory but if there is no apparent Check engine light currently on, will they do anything about it? Probably call and ask tomorrow.

bammartin7

There is a TSB so the light doesn't have to be on for them to replace it

HankHill

Do you know what the TSB is or can you paste it here. I looked in the 2011 F150 TSB's and did not see anything that I thought was pertaining to this.