'Upgrading' to skinny tyres pointless for London commuting

After reading this thread I was a bit surprised about the research into rolling resistance so I thought I would test it out for myself in a 'real world' setting to see what the difference is.

other people have alluded to it but I am going to say it outright.

I don't think your appreication of the scientific method or your understanding of the word control is particularly good as your study is very weak. In fact I think we have more proof that stoping and buying quavers will lower your commute time.