I only posted that because I admire your tenacity and style. My single track mountain biking days are long gone.
Dinny, if you have bad knees don't you think it is risky doing all those 10K runs, especially on asphalt? My surgeon told me years ago that long runs on asphalt accelerates the knee replacement timeframe, in which case you should buy a years worth of DAC purchases in this stock SYK
http://www.getaroundknee.com/why-stryker?cid=Google_Stryker-Branded_Stryker-1006&gclid=CMGlp8ze_bUCFag7MgodOyoAFw
'jus sayin'