Question about 2005 Dodge Magnum

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Gas Consumption Gas mileage from 600 miles early July to end of November approx 4500 miles was terrific. 16 to 19 mpg around town, 27 to 29 mpg on the hwy. Since then 11 to 13 mpg & 22 to 24 mpg respectfully. Had it into the garage numerous times but no improvement. I'm now wondering if the MDS system is functioning. Is there a way of checking this? I recently read somewhere on the net that the Tip Odometer indicates (flashes '4cyl on' and 'Trip odometer reading' at some type of interval) when it is operating on 4 cylinders. However i have never noticed this or is there is there some setting that must be programmed to get it. I bought a 2005 Dodge Mangum RT, as I wanted a comfortable vehicle that could carry a lot of cargo, and get good milage with the cylinder deactivation. The first few years the milage was fairly good, then it started to go down, and lately (even though I've tried to only use the car on the highway, with cruise control on) the milage is creeping steadily downward. It has gone from almost 20 MG to almost 17 MPG. I've taken it to two dealers. Both said that the car is fine, no problems at all. The last one told me that the problem is the gasoling. He said that the new brands have more ethanol, and that will decrease the milage. I keep it up, have it seviced regularly. Had the recommended 25,000 mile heavy service. It has actually been getting worse on milage since then. I'm wondering if some sort of sensor has been turned off, and the engine is no longer going down to 4 cylinders.

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  • Anonymous Aug 04, 2008

    i have a 2005 dodge magnom and new and still now with 24996 miles i still only get about 10-11 mpg city driving i took it to the dealer and they said i was the only person to claim poor illage and they said nothing was wrong!!!!!!!

  • yadayada
    yadayada May 11, 2010

    I don't think you have a problem, you are getting much better MPG than other owners I have talked to, the list of things that affect MPG is endless but I feel you would be wasting time and money to pursue this any further.

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If you have the RT with the 5.7 hemi as stated I do not beleive you ever got 27 to 29 miles to the gallon. the best that car will do is 24 - 25 miles to the gallon and that is on a pefectly flat and straight road at about 60 miles an hour. As fas as the MDS the best way to tell (if you can't feel it change) is to use a tool such as the dashawk that monitors the engine stats. I disabled the MDS for several reasons and really so little to no change in gas milage. I do not beleive the MDS helps as much as people would like to think. I have added a lot of mods to my hemi, but still think that 14 - 18 mpg under normal driveing is good for this car

Posted on Aug 15, 2008

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