Posted: 30/11/2013 at 23:22
You guys, what are you like! The concept of run walk is that it keeps energy and bounce in the legs, so most of the faster run walkers eg sub 3.30, don't walk after about 18m, but power past the macho, 'walking is for wimps' type folks towards the end. If someone gave you a new power gel, or great new shoes to take off 10 mins you'd bite their hands off, it's just a different way of optimising muscle usage.
I've only done a couple of slow marathons, but started at 52, after a lifetime of sloth, and only trained 2-3 times a week. but managed sub 5 hours with a very painful IT band problem from 10-20m, but the run walk meant I really did speed up when it went away and caught up quite a bit of time in last 6.
Hoping to do better in Rome next year, fingers crossed!