Bad fuel economy... - Dodge Cummins Diesel Forum
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post #1 of 7 (permalink) Old 01-22-2020, 11:21 PM Thread Starter
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Bad fuel economy...

2004.5 dodge ram 2500 5.9 ..Recently my fuel economy has gotten bad.. engine seems to be running exactly the same but went from 16L/100km city and 12L/100km Hwy and now I'm about 22L/100km city.. which is pretty bad.. normally got 550km to a tank down to 400km to a tank.. all city. But what could be causing this fuel lose. Truck is fully stock.

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post #2 of 7 (permalink) Old 01-23-2020, 03:02 PM
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Winter blend fuel causes a slight decrease in mpg.
Has the air filter been changed lately?
How may miles on truck?
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post #3 of 7 (permalink) Old 01-23-2020, 04:33 PM Thread Starter
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Truck has 390,000 km air filter is KN and was just cleaned out a month or so ago.
Also was looking into superchips for there eco mode to get better economy.
Also just wanna make sure I'm basing this all on L/100km up here in the great white north. Also fuel isnt cheap !! Haha
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post #4 of 7 (permalink) Old 01-23-2020, 05:31 PM
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Depending on where you are located, very low ambient temperatures will also cause a noticeable drop in mileage. Between the winter fuel and very cold air, a 20% would be typical.

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post #5 of 7 (permalink) Old 01-23-2020, 05:37 PM Thread Starter
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I'm in vancouver BC . Not to cold but with city driving..lots of up and down driving and barley getting the truck up to temp worh short drives.. I guess that makes sence. Also have 285/75/17 tires so maybe I'm getting more km then the truck thinks
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post #6 of 7 (permalink) Old 01-24-2020, 09:30 AM
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Really need to correct speedo for tire size using a GPS app on your phone or Nav system . Then hand calculate . Its the only way .

EVERYTHING is calculated on tire rev per mile ( or Km) , if thats incorrect the whole deal is flawed severely.
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post #7 of 7 (permalink) Old 01-30-2020, 02:17 AM
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To diagnose engine problems you need a gauge system so you can see EGTs, Boost, Fuel rail pressure and other important non factory read outs...

CP3 fuel pumps are easy to diagnose as good or not if they hold 20k+ PSI for a few seconds. Fuel filter and Air filter are very important. Lift pump could be failing too. It could all be fueling related, but stock without gauges you're flying blind.
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