Hi I have the same problem. It is for sure the Bosch high pressure fuel pump. Mine started at about 3000 miles, and it has gradually become worse until now 7000 miles, and is now truly annoying. Sadly the damn thing won't break down properly ... Ford says everything is fine, but it's not. What was a nice silent car when I bought it, now has a high pitch noise as the most dominant noise from the engine when driving at constant speed. Does anyone know if Ford ever has acknowledged the problem ?