I didn't see the original sheet, but this is quite handy. A couple caveats however. Also the Maintenance Items for the bikes do not update based on total miles, so if you have a 4k interval for oil changes but travel 20k miles, it only adds the cost for one oil change. I've already updated the spreadsheet to properly calculate based on total miles, working on a few other tweaks like what AllSeasonRider pointed out. Thanks for the resource, I'll post up the modified spreadsheet when I'm done as a thank you to those who put the work in before me.