Ok, here it is. I have always been a "mash the pedals" type of rider. I had this mindset that if I wasn't mashing a heavy gear and feeling my legs burn, than I wasn't working that hard. After doing spin classes the past 2 off-seasons and finally getting a trainer for my living room, I am trying to work on my technique and be more efficient. With that being said, I just did a 35 mile ride this afternoon, quite a few hills here and there, average speed was only about 14.2 mph. When I was in heavier gears, my bike computer showed that I was actually going faster, and as soon as I shifted to an easier gear, my mph decreased but I felt my cadence was the same. Looking at my training logs from last Summer, my avg. speed was anywhere from 15 - 20 mph on my commute. Going the same distance in a lighter gear is a lower avg. mph. Why does this happen?