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I recorded Tour Divide as individual days, converted to GPX by uploading to strava, then downloaded the GPXs, combined manually in Textmate, then simplified the route to 200,000 points in GPSBabel. Voila. The file was way over Strava's stated 25Mb, but still under 100Mb, so uploaded fine...
I use this one http://joewein.net/bike/gpxmerge/ (though only does a max number of 5)