I have almost 42k miles on my 2012 F150 Ecoboost that I bought on 9/30/12. It has a loud pinging sound, which everyone notices and comments on, but when I took it to the dealer for an oil change and to check the noise, they say it is normal and they gave me a service bulletin that mentions customers complaining of noise. But mine is more of a ping than a woosh, so I don't know if I trust them. I may take it to another dealer for a second opinion. The truck has great power though, so it seems to be running fine. I get 18-20 mpg depending on how fast I drive and if I drive the hills. I love the truck.