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Exnav wrote:So what does it hand calculate to?

between 30-32 down the Eway, 70 MPH loaded down headed on a week vacation. like i said, the newer low-sulfur fuel has had a negative impact, but it still hovers around 25 under the same conditions.

NightBiker07 wrote: the newer low-sulfur fuel has had a negative impact, but it still hovers around 25 under the same conditions.

That ULSD does suck. So I run Wal-Mart 2 stroke oil to offset the lack of sulfur. Really quiets down the injectors and improves MPG. Note: this is only for diesels 04 or 03 and older...

I mix a bottle of the deisel clean and the cheap two stroke oil from wal-mart. I use a pint per fill up and a quart when towing. With no tune I get 17mpg non freeway to work (58 miles round trip) and 20~21 mpg flat freeway calculated. If I run the preditor 120hp tune I still get 17mpg going to work but the freeway milage jumps way up to 24mpg if I stay under 70mph. At 55~60mph it is even higher but, who can drive that slow? The tune leans out the fuel mixture as long as I don't get on it and drive with the cruze on. I have to drive through Lambs canyon to and from work some I think the hills kill the tunes help but, on the freeway it is real noticable help in fuel milage. I have to calculate the milage because the dic is way off with the 120hp tune, it is reading 28~32mpg after I reset at the pump on the freeway. I get 11mpg towing a 27' toy hauler with more then 8000 pounds in it running no tune. I can set the tire size to be right on so the speedo and GPS are the same. Duramax LBZ 2006 6" lift 35" BFG's.

bob are you jumping your truck already?

[youtube]http://www.youtube.com/watch?v=02ngMc3b ... re=related[/youtube]

Bob, I'm totally bummed about your truck...