I asked customer service, what the average power consumption on Asus DSL-N66U was. They would however not tell me, due to "competion"-reasons.
This is a ridiculous thing trying to keep as a secret, since it is very easy to measure after you have bought it.
I'm trying to get the info through customer forums instead. Some review sites post the average power consumption during their tests, but I haven't found any info on DSL-N66U yet.