Well, we had about an hour to ride. So... after inviting our son over, who has been commuting/riding for about a month, we decided to take him on an 11 mile hill ride.
We have created a monster.
He stayed right behind my DH going up Strawberry Hill, on his mountain bike, with sneakers and flat pedals. I was barely keeping up.
He dropped us both going up Annursnac Hill (our street, which SheFly calls anneurysm hill), as we were tired. His average was 14.7. Well, I guess the fact that he is 29 years younger than me counts.
It was really fun and we look forward to more riding with him. He was eyeing younger son's classic Serotta hanging up in the shed.