keep in mind, airfilter and muffler changes will get you 10% more speed, but, it'll cost you 25% of your MPG.
My bike averages 70 mpg over 16,000 miles with air filter, and muffler changes. It isn't the changes you make, it's how fast you go that changes the mileage. I liked to keep mine at about 60. If I ran it up to 70 the mileage dropped markedly. But a lot of the good mileage was made at high altitudes which you don't have a lot of in MN.
Blue Loctite isn't a good idea, it's mandatory! Get some and put it on every nut and bolt you can find! In particular, tank mounting bolts (2), 3 little screws that hold the heat shield on, these also hold the muffler on! Motor mount bolts, etc. The bikes will remain in one piece very well with the loctite.
As for K&Ns, I used them, but it wasn't the one they are selling now. I had one from a BMW 1200C, P/N BN-1298. IT is bigger than the one being sold now, and I never had any problems with it at all.
You don't need an iridium plug, the standard NGK BPR6ES works fine. Saves you $5.00 or so. I put 15,000 miles on one and swapped it out because I had more here anyway.
The chain is junk.
As for break in, the breakin given in the owners manual is straight out of the 4 speed iron barrel book,and has no validity whatsoever to the UCEs. I broke mine in buy checking the throttle and finding how much throttle was halfway and noted it on the grip and throttle casing. I never exceeded half throttle for 5-600 miles, then I started easing on up. That still gives you adequate acceleration for traffic and top speed around 55 or so. You will definitely use 5th gear! You want to use the gearbox a lot to break it in. You should find some twisty roads to ride and keep changing speeds. Do not go very far at a consistent throttle opening. Keep varying it as that improves cylinder lubrication an ring breakin.
But basically od ride it and use it mostly as you normally would without the stoplight grand prixs. Enjoy it and learn it as it learns you!
I changed my oil initially at about 300 miles then at about 1000 miles, then just followed the books maintenance schedule. Kevin, the importer and host of this forum offered about the same breakin regimen in a post awhile back, but I don't recall where it is.
Get some cable lubricant, I use Dri-Slide. Lube your throttle and clutch cables. They will last a LOT longer! As in double or so miles.
Bare