I've had the 5.4L for 8 years and the engine is indestructible.
It's the best thing since the 300-6.
With a few modifications it will outdo all the other trucks.
I've added a cold air intake, magnaflow cat-backk dual exhaust,
and an Edge Programmer. I get great performance and great mileage...
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I have a 2005 Expedition EB with the 5.4L and 87K miles. It is
a great engine, powerful and good milage. I get 13-14 mpg in
the city and 17-20 mpg on the highway (65 - 70 mph). 15 mpg at
The only trouble with it is that I had one of the ignition
coils burn out at 75K. And I had to have the accelerator
pedal sensor replaced also then because it was intermittently
failing also. Not bad for 87K miles.
Here is a few suggestions. I run a 5.4L myself. I get great mileage.
I have only changed 2 ignition coils, and that was before my modifications.
I put cat-back Magnaflow dual exhaust. I put on a cold air intake.
These both made a little improvement in milage and power. But the
big improvement I got was with a programmer. I bought the Edge
Evolution Programmer. And I run regular gas all the time. I have
had the programmer for 150,000 miles now. Have not had to change any
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