So I have a 07 Mega 5.9 with 134,xxx miles. I am considering selling it and getting a new 6.7 , but have heard they are not as good as the 5.9. Is this true? How's the mileage with the 6.7's? I pull a 13k 5'er and was playing with the idea of a dually for the extra weight capacity. Are the DPF's a big hassle and have problems?
Finally I know that when the 6.7 first came out the had injector trouble. Anyone know if they fixed this prob? If I get a new one it will be kept stock.

Thanks in advance...
Joe