.......Having used both a 6.2 and ecoboost I can tell you hands down the 6.2 returns better fuel economy pound for pound with more power on tap and better reliability. The look on some friends faces pulling a heavier boat on the same road at the same time in the identical truck with the exception of different engines and return better fuel economy with a V8 was priceless. It was even funnier when I could walk away from the ecoboost from 60 plus mph with the trailer.
When was the 6.2 available to the expedition? I've only seen it and currently have the 5.4. I'm also curious what the real issues are that you've experienced with the echoboost. It's numbers are higher than the 5.4 so it should outperform them. In online video reviews between various competitors and the F150 with echoboost, it held its own and even outperformed.
Appreciate your time on the reply. I personally wish we could have the diesel of the Excursion, but we don't.