That's what I'm working on! The funny thing is that I live in an area with a lot of hills and mountains. Since I've gotten into road cycling I have been riding up a lot of grades slowly followed by long 40 mph descents coasting my way down. My average "long" ride was in the 30-40 mile range on weekends and I've quickly found that 10 miles on the trainer is killing me because I have to keep pedaling. Now I feel like all of the road riding I've done in the past was completely inefficient as far as actual training goes