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Manual states you can run 87, so that should answer your question. Don't really understand how the opinion of a bunch of yoyo's on the intertubes ;-) could have more authority than the manufacturers manual.
Anyway, I run 87 all the time on both our trucks. One has lasted 185000 miles so...
Just wanted to comment here that your dealer is full of Sh*t. When you have 15% left on your oil (according to counter), then you are not 3000 miles overdue. Don't let them push this on you. They changed the oil, they own this and should fix it.
Start communicating in writing (email) and...
I had mine installed through Safelite, and actually drove the truck while the installer did the calibration. It's mostly just software doing its thing while you drive the truck at different speeds, so for someone with the right tools it should be no problem.
Surprising that the dealer...
Slight rubbing in 'Aero' when cranked all the way over - something I never do so it doesn't bother me. No rubbing in 'Normal' AFAIK, and I don't drive in 'Entry/Exit' so I didn't test that, but it probably rubs there.
Truck is otherwise stock, no level or lift or spacers.
I used to drive a 2014 Big Horn, now drive a 2020 Limited (my wife still drives the 2014).
Big Horn had no fuel saving features, Limited has eTorque, grille shuitters, aero mode, powered airdam, auto start/stop. Trucks are within 200lbs of eachother. Both have 3.92.
Mileage on same commute...
Experience has taught me that my gun should be either on me, or locked up (in truck or at home) when I can't carry it. This prevents me eventually forgetting about the gun at some point, and also makes sure I have the gun when I might need it. I'm also not a fan of having/leaving gun in plain...
I just had Michelin 305/45-22 installed today. Changes are only 0.7" added diameter, but I like the looks of it. Doesn't look as skinny anymore. Also, that size Michelin is rated for 9" wide rims, so stays within spec of OEM rim, saving me some money.
Slightly wider tire looks good as well:
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