Thanks Guys for all answers.
Yes, I have Tahoe 24gl diesel.
I’m using it for the long trips not at all in the city.
And after some research I found, GM released another update in Feb 2023 that changed the previous vehicle parameters.
After another trip I found my mpg get much better than before...
Thanks guys
Fortunately, I don’t have any warning lights on.
Tire pressure is ok
Didn’t change fuel type.
I drive it about 1000 miles which I did it more than 10 times in the past and filled the tank from the same gas stations. But the results are not favorable.
With a full tank I could drive...
Last month I had my Tahoe 2021 LT Duramax for routine maintenance oil change in the dealer.
It's mpg/mpd changed from avg 30 to 26.
The dealer said they didn't do anything.
I'm not sure what I should do.
Does anybody have a similar issue?
Is it maybe because of bad injectors?
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