What kind of mileage from 6.0L?

[roger2003]

I'm getting 14-18 daily driving, Towing 19-24 with the power pup tuner and a moderate foot

 

[moto058]

I was getting 17-19 mpg. Now after the last 3 fill ups I'm getting 7-8 mpg. No leaking fuel. Does anyone know where the problem could be? I replaced the filter drain valve 14 months ago as the leaking was obvious immediately

 

[DaveBen]

Winter fuel will cause a drop in mileage, but not what you are seeing. Have you changed the air filter? That will help.

Dave

 

[moto058]

yes,new filter. I have a diablo sport chip in it, could it be the chip malfunction or something electronic? everything else has been normal. I guess if I pull the chip out I will find out