The last couple years on the Saturday closest to the summer solstice I have been riding the Harpoon Brewery to Brewery Ride, a 148 mile event with somewhere around 7,000 ft of vertical. The guy I do it with is suggesting that for this year, we instead do the Vermont 100-200 (same day) which consists of an unsupported loosely organized ride of maybe 40 riders. It is 212 miles, most of which is on Vermont Route 100, and I believe has a little over 10,000 vertical.
How big of a difference is it between 148 and 7k and 212 and 10k? The first time I did the 148 miler I had many 100 milers under my belt and the difference was mind-numbing. I have since changed the way I train and my body accomodates that ride pretty well. I finish with gas in the tank, have a beer (it finishes at a brewery, after all) and some food, then a two+ hour drive home. I just wonder how much more gas is needed to go the 212? Especially, since there is a big momma climb late in the ride. In fact, the bulk of the climbing is in the second half.
Anyone done something like this? Advice :-)