I bought Powertap P1 pedals and when you own a power meter, you will find that power is measured differently. There is 3 second power, average power, nominal power, etc. Average power usually isn't a good stat to go by because if you free wheel at all, it is included into that number. I've gone 17.8 and barely doing 130 watts and I've also gone 17.8 doing 260 watts depending upon the wind or if you're drafting.