Originally Posted by Hopper (Post 1445112)

Like I mentioned in my previous post, I noticed a 4-5 MPG drop with the XZT. I've been playing with it off and on for the better part of 18 months. I don't have a heavy foot, at least on the long trips I installed it for. When I first had it installed, I was making 500 mile trips between the Texas panhandle and northern Colorado, or 750 mile trips from the Abilene area and northern Colorado. The majority of that data was gathered while on cruise control between 65 and 75 mph. The only stops were for gas or to let me and the dog do God's business at a rest area.

When I first had it installed, I drove with an even lighter foot, to eek out the most MPG I could from the module. I was surprised to see the OH display show 24 MPG. I was excited until I did the manual calculation and saw that it was actually 11.6 MPG for the trip returning to Amarillo from Denver. I average around 17 MPG on that same trip without the module installed.

This week, I've pulled the module out of the glove box and reseated all the connections. It's a 70 mile drive to my current work-site in NE Colorado. 40 miles paved roads at 65 mph and 30 unpaved at 45 mph. I've put 217 miles on this tank, and I'm below the 1/2 mark now, so I'm still seeing a significant decrease in MPG with the XZT.

So, in my application, the module doesn't improve MPG. The seat-of-my-pants-meter, that someone else had mentiond in another thread, doesn't even register the added 60 hp that this module is supposed to provide with a heavy foot. It takes the same ammount of time to reach the my marker fence post from the stop-sign that it takes without the module.

Originally Posted by qzilla (Post 1445144)

You have something bad wrong then. Not just on the mileage side but, on the seat of the pants side as well.

I am not sure as to what the issue might be and we have had no major changes in software for the 03-04 250 or 205hp trucks? I would be happy to update it to make certain but, I am pretty certain you got a bad problem.

Could be a relief valve or something else who knows but, not only is that un-common that is the first I have ever heard of no power and a huge loss in fuel economy. I have had guys that say they just don't get a mileage gain or they drive too hard or something of that nature but, it tends to be a break even or about the worst I have ever heard was a 2mpg drop and he said he just liked the way it felt?

Whatever happens you need to get that thing fixed. Heck I can go 350-375 miles on a half tank of fuel.

Originally Posted by 94 dodge (Post 1444994)

What is your mi per gallon now. Saturday we're getting exaust on the truck. I hear exaust can give two mile per gal improvement, air filter is another 2 miles per gallon, then a 2 mile per gallon on the chip.
An imporvement of 6 miles per gallon would be sweet, Maybe thats just wishful thinking