Which Setting?

[lords88]

I'm making a long trip to go guide this weekend. Since diesel is so freaking expensive up here now, I need the most out of my buck. Which setting should I run chip on? I don't have an economy setting but I have tow, 120, 100, and an 80hp setting which one will give me the best mileage. I'm not pulling a trailer or even a fourwheeler it is just me and the truck. I have heard that people get really good mileage on the highest setting but I have also heard that it is hard on your engine to. Any help or comments will be greatly apreciated!

[Diesel Freak]

My performance setting at 85 gets me my best mpg

[cstroke69cpy3]

just had some experience with this one...
Drove out through pa down through the mountains of West Virginia, and across Kentucky, 12.5 hrs each way. On the way down at 70 to 75 mph at 2100 rpms I got 18 mpg from both tanks of fuel. This was on the 80 hp econo.. On the way home with the chip in the 120 race I got 21 mpg at 65- 70 mph the tach at 1900 rpm.. I didnt switch the chip until half way back through kentucky so some of the miles were on the flat and many on the hills of W Virginia..

[lords88]

Well I have heard that it is ot good on your engine to run it a long time on the 120 settings. Is this kinda true or just a myth?

[Jesse.James]

yeah you would think that the higher the hp the more smoke therefore less fuel mileage. i run mine on 50hp just cuz im like you i worry bout hurtin the motor and i think less smoke better mileage. but most economy chips are like 80hp so i might be better off on my 75hp setting im not sure either. im sure the higher hp would be better mpg if you drive sensible.. thats my problem when i give myself more power i use it. lol

[lords88]

Yeah well I think I can manage to make myself drive sensible, on this trip I just paid $3.45 a gal for diesel yesterday! How much is diesel around your area?

[GreenF350]

As far as I can tell I get about the same between my 80hp econo tune and my 120 race tune. I don't know if just driving on a higher tune is bad or not. I have noticed that at a steady speed with cruise on that my boost and EGT's stay about the same between my 80, 120, and 140hp tunes. The difference is when I step on the stupid pedal...lol. So it would seem to me that if you don't horse it, that it would be fine.
-Aaron

[lords88]

Anybody else have any advice or comments?

[Dave]

I run mine on a 100hp tune all day every day and get 17-20 depending on my right foot

[Jesse.James]

i think this sucky fuel has alot to do with poor mpg. im goin to start using additives all the time! i bought fuel last 3.27 but if i go the other direction from my house its 3.09