2018 3500 120k miles.
These are typical performance mods that most of us here have.
Stage 2 trans from Inglewood transmission 35’s & 3:42 gears
The air filter isn’t dirty; the fuel filters changed, and there was no remedy.
I have been using fuel as if it’s a gas truck driving to and from work over the last week or so.
Would valve lash bring out of tolerance cause a drop in fuel economy?
Have exhausted all simple fixes that usually lead to a decline in MPG.
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