I still don't think the cost of getting the tire on the bike should be a part of this analysis.
You didn't mention the amount of labor for doing the Dark Side Mod to the bike.. only the amount for the parts.. piddling.
Do we mention the money spent vs the aggravation saved on having the tires put on the wheels? What about putting the wheels on the bike?
Some people pull the wheels, take them to somewhere, have the tires mounted, then put the wheels back on themselves. (That's me)
Some people just take the whole bike to the shop and have them do all the labor.
Some people do it all themselves. If so, what about the price of any special tools to make that happen? (Gonna buy me an umpteen gigiillion dollar tire machine, and the hugemongous air compressor to make it work so I can change my own tires out without busting a knuckle). Yes, I exaggerate.
Yes, I understand it is "Mileage/Cost per mile", but it doesn't tell you which tire gets the prize if you factor in the price of all the different methods of shipping, the various labor that can be added, or the aggravation and mayhem of the pieces you do yourself!
Yes, I understand it is your war, and you will slant the body count as you desire. Just my opinion that the way to do it:
1. Person says they have a tire.
2. Find out the best, worst, or average cost to land that tire in their hands. Use the website(s) of your choice. (Price will also vary depending on sales, how far to ship, if you ship, or did you just buy it from your buddy down the street). So, use as few websites as you can and calculate based on shipping to YOU.
It may not be perfect, but it is closer than somebody having to pay shipping to outer Bavaria from Timbuktu if that is the closest place that has it, while the next guy only has to walk around the corner and grab one off the floor.
And then you can measure tread wear.. OH WAIT.. ummmm..
Gee.. guess what? Road surfaces really impact tire wear. I know a guy that rides ALL over the place.. and a lot. He says the roads out in the Dragon area will eat a tire up a LOT faster than most places he has been.
And how you ride has some influence as well.
Oh well.. continue on with your war. I will send you my Metzler mileage figures anyway.
I shall now cease and desist. Retreat and surrender