My 2016 EcoDiesel had a Turbo failure that didn't throw any codes... I suspect the problem was happening with 3000 to 4000 miles on the engine and possibly failed while on a road trip from Virginia to Maine and back... The reason for taking the truck in was because of sudden decline in fuel economy... The dealer indicated that the turbo was not responding to demand. Following the turbo replacement, my fuel economy only rebounded a small percentage. What I'm wondering is if the turbo wasn't working for most of the road trip, then what might have been the downstream impacts. Is it possible the pre-catalyst is partially fouled, could the egr be caked with carbon??? Why is my fuel economy not returning to where it was ? Where I was getting an average of 23 to 25 in town and 27-29 on hwy, I'm now getting 19-22 in town and 24-25 on hwy. Also, I'm noticing that on trips of 3 to 4 hours, I see a reduction of 1/8-1/4 inch of coolant in the reservoir. There are no indications of any leaks. The dealer noted that they did notice that the overflow hose showed some dripping. The fill level with engine cold is in the middle of the fill zone. Currently the engine has 7900 miles on it.