Last bike ride of the season?

I got to ride my new bike for probably last time of the season. Was almost 41 degrees...went with a coworker at lunch. 6 miles, about 32 minutes. Averaged 11mph. (actually averaged over 12 for the entire ride until the last hill. I had to granny-gear my way slowly to the top, but I made it!) Fitday says 500 calories. Sweet. I have a 'super-size' seat that I bought for $70...worth every penny. I don't think I could/would ride with a 'regular' seat. It looks like a giant black mushroom...but it sure does feel good. I'll miss it over the next few months...(especially the calories I could burn)