gas mileage of the excursion 5,4 v8

Hello,

Im thinking of buying a 04-05 Ford excursion 5,4l v8 cause i need the space for my dogs and prefer the look instead of an AWD van from Chevy or a quigley conversion from an e-series van(too expensive).
I dont want to use it for towing,just for holiday trips and visiting family and friends in different City.
I only do around 6000 miles per year with the big car cause of the worse gasoline prices here in germany.

I would like to know the gas mileage i could expect from this combination compared to my current vehicle a 98 Chevrolet tahoe.

With the tahoe i have around 18 MPG on the Autobahn at a speed of 70-80 mph faster i never drive faster with the big one.

Is the excursion 5,4l v8 on nearly the same MPG level or is it much worse than the tahoe?

I mean a little more is OK cause its heavier but when gas mileage is at 9-10 mpg on highway then i would stay way from the excursion.
Thats why i never consider the v10 cause its to expensive here in taxes,insurance and gasoline consumption.

May be you can help me with my decision.

Best regards
Vinzenz

Vinzenz,
I drive the 6.0L PSD version (2005) but my friends report 13-18MPG… with 15MPG being average. That being said, they keep their beast tuned up, and the tires inflated properly.

type in GOOGLE ..... 5.4 triton blown plug. NO! dont buy used 5.4.... i was quoted $2300 dollars to repair. MY friend (28 year ASE certified Ford mechanic) said its a common problem Ford wont fix.... He did it in an hour charged me $120......that included $80 dollar coil pack. SCARY PART WAS HE HAD TO DO IT 3 TIMES TO THIS ENGINE!