Quote:
Originally Posted by Fishmaster19
The 6.7 has fuel system issues and turbo issues. I dont care what anyone tells you, there is not a truck on the road with stock tires or big tires programmer or no programmer delete or no delete that is gonna get over 20mpg! If it does then they must have put 20k under the hood...and where is the savings in that?! the 6.7 shoud get around 17 or 18 on highway and the 5.9 will get 22 at 60 to 65 mph. go to 70 and itll get down to 20 or below.
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I have never had fuel system issues on my two 6.7s and all of the turbo issues that I have heard about were the direct result of the clean burn exhaust system malfunctioning. I can tell you this my dad has had both the 5.9 and the 6.7 and the 5.9 gets better mpg but doesn't have near the power of the 6.7 stock. Now when he put an H&S tuner on the 5.9 it helped it some but it still won't run with the stock 6.7.