HTupolev

Different postures need to be trained for in general, and recumbents are a big change in posture.

I don't ride recumbent, but I know a couple guys with Bacchettas. Right now they aren't getting much use, but for a while, one of the guys was riding his 'bent a lot. During that time, he was getting pretty similar power numbers between the recumbent and his road bike. Things got interesting on the climbs: sustained steep uphill was usually a smidge faster on his road bike, but on climbs that were shallow or had dips to the top, he'd sometimes be faster on the recumbent despite it having a pretty large weight disadvantage.