I did El Tour for the first time last year. I have been riding pretty seriously for about 3 years now, but had other commitments the first year and injuries the 2nd year. My longest ride prior to El Tour was only about 75 miles. I finished in 8:07, slowed down quite a bit at the end because my knee started hurting around 30 miles before the end and I took it easy and stopped a lot more after that.

I'm guessing that Tahoe would have a lot more climbing. If you need more info besides the map, feel free to follow up here or PM me.