Changed fuel filter just like you asked and only gained about .5 mpg. I am now getting 17 would like to get aleast 19.

I replaced the fuel filter because I do not know when it was change since I have only had the truck a couple of months. But I don't see how this will affect the fuel milage. I will check it the next couple of tanks.

I have a 04 duramax with the LLY, all stock. I have been getting between 15 and 16 mpg hand calculated. I bought a new predator hoping I would gain 2 or 3 mpg, but after two tank fulls still getting around 16. I drive 45 miles one way to work daily running between 60 and 65 mostly highway. I ...

I purchased a predator U7185 that was used in a truck that has been totaled. I plugged it up to my 04 LLY and it says it is locked with the diablo 85 HP installed. Does this mean that the truck has the 85 hp still in it and the factory tune is in the predator? It has the rev. 2.00. What is the cost ...