If you look at the measurements of
Bicycle Rolling Resistance they fully confirm what joey buzzard is writing: the marathon are very good, much better than the Marathon Racer and Kojak, much better puncture resistance comparable rolling resistance, very strong and long lasting tire.
The only tire that perform much better in rolling resistance while having also a good puncture resistance are the new Continental Contact Urban. The only weakness of these tires is the sidewall resistance. But its the price to pay to have a less rigid tire that weight much less than the Marathon.