Because of work commitments I spent very few hours/miles on the bike in March, and also missed the first two weeks of April due to hay fever/asthma. So when I started riding again in mid-April, you could say I was, um, well-rested. My first ride back sucked, big time. My next ride I set my best 5-minute through 10-minute MMP of the year, at pretty close to my max HR. I don't think my "efficiency" improved during the hiatus, or between my first ride and my second ride back.