New lawsuit against Cummins/FCA
A class action suit has been filed against FCA/Cummins over diesel engines in the 2500/3500's. TFLTruck, this link explains better Filed July 3rd. Looks like the reflash kills fuel mileage.
Forum Discussion
travelnutz wrote:
Mileage probably didn't drop at all because the new tires have more tread left with means a larger diameter tire which results in fewer revolutions per mile driven being shown on the odometer for the distance driven divided by the fuel used which then will show less mile per gallon numbers. Still traveled the same distance with the worn tires which had turned more times per mile due to the now smaller worn tire diameter to the road. Easily can make a 3%+ difference in hand calculated MPG's just like going to a larger diameter tire sixe does in altering perceived MPG's or actual speed driven.
That could have played some part however the truck was making 27/28 MPG @ 77 MPH just before the tire change and now I'm down to 24/25 MPG. We just did a trip to Cocoa Beach and the best I could get was 25 MPG and in the Mountains it dropped to 23 MPG :M . But the truck would make that 27 MPG @ 77 MPH new so not sure what has caused the drop in mileage.
I called GDE and they told me they have seen this on other trucks they do tunes on also, like the Colorado diesel they are testing.
