Shellene and I spent the weekend in Austin, and managed to get in a ride taking in some of Austin's better known hills.
 
We started on the north end of town, riding the rolling hills of 360 (big rollers), and then headed out of town on Bee Cave Road (still more rollers).  We took a slight detour down Cuernavaca Dr, where I got slightly confused and thought I had taken a wrong turn.  This caused us to ride back up the same climbs we had just come down (one at 13%).  After climbing the Dam Hill on 620, we took a detour past the Oasis to set up a climb up Bullock Hollow.
 
Bullock Hollow is a no shoulder road, that hits 18% during it's mile climb (average grade of 7%).  I ended up off the road during the climb, so I got to walk to the top (I tried restarting on the grade, but one wheelie was all it took to know that it wasn't going to happen), while Shellene spun her way up.
 
From there we headed into Riverplace, which has three different hilly roads for a total of 4 miles:  Riverplace, Big View and Westminster Glen.  There is one hill on Westminster that neither Shellene or I had to pedal on, we had carried that much momentum from the previous descent.  This section has multiple places where my GPS reported 21% briefly.
 
After descending City Park Road, we had the option of heading back to the start, or turning left to climb Jester Blvd.  328 feet of climbing over .46 miles (13.5% average), with the hardest pitch at the bottom where it hits and holds over 20% on a chip seal road.  Needless to say we turned right.  However Shellene stopped me and said she would wait at the bottom if I wanted to climb it.  Being the fool I am, I agreed.
 
Just as I was getting ready to make my ascent, a mtn biker rolled down the hill and started his second repeat.  I figured I could use the company, so I followed him up the steep section, then passed him and led to the top, taking 5'10" to ride just under 1/2 mile.  I averaged 5.3 MPH, 77 RPM with an HR of 156 (peaked at 176).  He rode down to the bottom with me, and asked about the bike.  Like almost all Austin riders, he had never seen a recumbent on the road.  In all my years in Austin, I had only seen a handful at the Veloway, and all but one of those were handcycles.
 
After that, a slow roll back to the car and called it a day.  51 miles in 4 hours of riding (5 hours realtime)
 
http://trail.motionbased.com/trail/activity/8538774
 
Lessons learned:
 
1:  It is possible to pop a wheelie at 8% if too much power is applied
2:  It is possible to climb 21% without popping a wheelie
3:  I can't start my bike on an 18% grade
 
 

yup, I have found all the above to be true.  Also, unclipping when you have an "oh crap" moment is ahem...interesting!