Tl*the contact owns a 2006 chevrolet silverado 3500. while driving 60 mph, the vehicle goes into safety mode. the vehicle drops to 20 mph without warning and cannot go any faster. the vehicle was towed to the dealer over sixteen times and they stated that the fuel filter was the cause of the failure, in addition to the type of fuel that was being used. the contact stated that he has been using the same gas and grade since he purchased the vehicle. he also placed different additives into the tank to stop the failure, but it still persists. the failure mileage was 42,700.