Here's the gear of the 2013 Kona winner. If you can make it fit, it'll probably be the most efficient thing you can ride. Here's the rest of the winner's gear:
2013 Kona Top 15 Men Bike - Slowtwitch.com


1. Frederik Van Lierde
Belgium
height: 184 cm / 6 ft 0.5 in
weight: 72 kg / 158.5 lbs
bike time: 4:25:35
bike frame: Cervelo P5
size: 54
aerobars: 3T Aduro
front wheel: Mavic CXR 80 T
rear wheel: Mavic CXR 80 T
tires: Mavic Yksion CXR, Power link (back) and grip link (front)
components: Shimano Dura-Ace D-2 (11sp)
gearing: 54/44 Osymetric and 11/28
powermeter: SRM
display: SRM Powercontrol 7
saddle: Prologo Nago Evo Tri CPC
helmet: Ekoi CXR13
pedals: Mavic
cycling shoes: Mavic Tri Helium
clothing: Castelli
sun glasses: Oakley