Not many. Our usual weekend ride is 57. I've been trying to find a good way to change it around and bump the mileage, but it's tough to do in this area while still keeping to low-traffic roads. There's one cool way I found to bump the mileage, but it involves riding over 2 miles on loose gravel. Not great for a bike with 23c tires.
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Current Stable: Trek Emonda SL - Trek Top Fuel 8 - Scattante XRL - Jamis Dakar Expert - Trek 9700 - AlpineStars Al Mega