How does running programmers(Edge, Bully Dog, Banks), specifically plug in modules, effect fuel milage. I have recently purchased an '03 2500 CTD w/ an Edge EZ module. It has 38000 miles(auto) and has been getting around 13 mpg. This is with the module set at the highest setting. If I turned the level of the module down should I expect increased mpg??

 

I think you better check your math. I don't think any of the 24V 600 Series are getting anywhere near 22.8 mpg. Especially at 70 mph! A lot of the older 12V diesels were capable of 20+, but don't know anyone with a new one getting that number. It is no doubt that horsepower costs mileage and that fact doesn't change diesel or gas.

 

Tyler_02,

Do you have a six speed or Auto? I would like to know how you can get such great MPG at 70 MPH on winter fuel being my truck is lighter then yours as I have a Short bed! The best I've gotten out of my 06 with Auto trans was 20.5 mpg (hand calulated) and that was with #2 LSD with PS and MMO in the tank last summer and driving no faster then 65 MPH on a flat Hwy. The best I have done on the Hwy with winter fuel at -10 to -15 below zero is 16 mpg with 8 oz of Lucas in the tank (hand calulated) with a tail wind. All I know is that the colder it gets below -15 below zero the lower my mpg will be, even if I have the truck plugged in for 4 or more hours to not have any warm up time to hurt mpg.

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How much diff would you gain by running synthetic Rotella vs the regular?