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Q: fuel mileage on 2009 Dodge Ram 2500

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when I bought the truck in Jan. 2010 it got 21 - 22 mpg on the highway. In March or April they callad and said to bring it in for a recall. They re-flashed the computer and immeadiatly it went to 16 or 17 mpg and I don't know what to do to offset the reprograming.
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This is Emissions Recall J35. Regeneration Strategy It is Emission related and is Mandated by the Federal Government. Subject of Recall J35 - The Engine Control Module (ECM) software program on about 159,700 of the above vehicles may cause illumination of the Malfunction Indicator Lamp (MIL) when no problem exists or under certain conditions allow heavy sooting of the turbocharger, exhaust gas recirculation valve and diesel particulate filter. Heavy sooting could damage emissions components and result in increased emissions.
REPAIR; The Engine Control Module must be reprogrammed (flashed).
This should not affect your fuel mileage anyway. Ask your Dealership if Emission Recall G30 applies to your vehicle. As stated in Recall J35, verify that Emission Recall G30 - Replace Oxygen Sensor Module and Reprogram ECM has been performed. If not, perform Recall G30 first. The Cab Compartment Node (CCN) module may have to be reprogrammed (Flashed) with new software.
- It is recommended to discuss with the customer any required necessary
maintenance as suggested in the owners manual. Inform the customer the
importance of properly maintaining their vehicle. Possible required maintenance
items may include (not limited to) lube, oil change and filter service, air filter
replacement, fuel filter replacement, and crankcase ventilation filter replacement and EGR valve cleaning based on customer use and mileage accumulation.
Call or show up at the dealer that did the work and explain what your have experienced. Ask them what the reflash was supposed to fix and why it effected your mileage in such a way.
I already tried that and I was told that the recall was mandated by the federal government and no further explaination was given. I don't want to know where I can go to find out something, I want to know what I can phiscally do to the truck to make the fuel mileage better. Not a lot but 2 - 5 mpg better without killing either my warranty or my wallet.
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