Hunter of Trolls
Join Date: Nov 2012
Location: east coast
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I get around 16 overall... 15.5 city, and sniff 20 on long highway runs.. I should update my fully to show details..
Here is the thing about tuning, fwiw:
If you tune a healthy rig, you can graph and expect gains within that tunes range.. if the engine and drivetrain aren't healthy, you can toss graphed expectations out the window... Tuning pushes the envelope further than oe parameters, and while doing so often exposes issues already existing that you might not have previously known about...
You should be getting better mileage than that, so, no matter how the truck runs, something is amiss.. you said it improved slightly with tuning, but not a lot.. so.. The tuning didn't expose anything.. which means its likely a hard part instead of fuel delivery..
I like puzzles.. I'll have to think on this..