NGK 6619 Iridium Spark Plugs LFR6AIX-11 tips melted way.

Those are probably fake plugs. I pulled a set off my 2014 Tacoma and my 2008 that I put on and pulled them at about 10,000 miles when I realized they were fake. I will either buy from local store or Sparkplugs.com. I change the laser iridiums at 100,000 miles on the Tundra and I will change my Tacoma at 80,000 miles.

 

Weird things can happen when the incorrect plugs are installed. The internal resistance and heat range may be different.

I can't prove it over the internet but I've seen incorrect plugs (iridium in place of copper) cause CAN/BUS communication issues, random stalling and misfires

Not trying to crap on your new Autolites but I won't let those anywhere near a car. Too many experiences with intermittent misfires

 

On Amazon purchases, to help ensure you aren’t sold counterfeit anything, make sure the item(s) you are buying is/are coming from an Amazon warehouse and not a third party vendor. Iridiums can last 100K but they should be pulled for inspection at about 60K-70K. On my first set of NGK iridiums, the gap was out of spec at 110K, but not nearly as bad as the OP’s. For my second set, I got Denso Long Life iridiums, they have a hardened electrode, but I will still check them by 70K.

 

I've replaced a lot of plugs in my days, always go with NGK, never seen an NGK look like that.

Me thinks a fake.

 

Autolites flood in the winter here, I'd rather run your old plugs than autolite.

Just had one towed in from the mountains and no matter what I did, the autolites would not fire, I used heat, lighters, evaporation everything. The ceramic was even distorted.

 

the truck is like new. MPG is back. Also my Towing power is back. the truck did not seem labored as much.