JohnnyR
09-25-2007, 13:45
I've noticed recently that whenever I fuel up my 05 2500HD Duramax LLY, that it takes 20 miles or more before the DIC mileage readout slowly crawls up to its maximum average mileage. Used to reach that max mileage readout in 5 miles or less. DIC at fillups has consistently read 5% higher mileage than what's computed by hand. Anybody have any guesses as to why it's changed? Could it be a function of the ULSD?