First time I ride with slick tires on my mountain bike. Here are the stats for you to judge if it makes a difference:

Overall

• Distance: 17.76 miles

• Time: 1:29:13

• Average per mile: 5:01

• Top Speed: 25.9 mph

Lap 1

• Distance: 9.70 miles

• Time: 52:16

• Average per mile: 5:23

Lap 2 (return leg with the sandhill road down hill)

• Distance: 8.06 miles

• Time: 36:57

• Average per mile: 4:34!!! (my fastest ever time on a bike)