I just found this on pickuptrucks.com. Looks like a sweet deal if anyone lives around Laughlin, Nevada. Click on the link for the story. They're offering to pay gas, food, lodging, etc. for 5.0 and EcoBoost owners who are willing to test their trucks for the site to determine actual fuel mileage results for both engines.
This is a great offer! This is exactly the kind of test I've been waiting for. Let's hope they can find a few people willing to participate. If I had a truck, I'd make the drive down to SoCal, but this is the information I need in order to make the purchase decision :-)