He built his bottom bracket on his bike from a washing machine bearing if I remember correctly!
There isn't nearly as much difference as you would think in bikes, parts, tyres etc. I've a cheap cross bike for commuting with pannier racks, flat pedals, 35mm marathon (not plus) tyres. I also have a decent roadbike with an aggressive position, spd-sl pedals and 25 mm grand-prix ii tyres.
Generally the cross bike is only used for short distances, but when I'm working away I'll take it on the roof of my car and go out for a ride in the evening or early morning. I can jolly it along and while there might be a 1mph average difference over a 35 mile ride I don't think there would be more than that.
It does feel good going back to the best bike after having done a ride on the commuter though.
I think there's a lot of truth in that.
I have a "road" bike in 531c steel tubing, with 25mm GP4000sII tyres, no rack, no baggage.
I also have a touring bike in 531ST (which is stiffer and heavier), with 32mm Gatorskins (sometimes with mudguards), rack and bag for carrying my food for the ride and an assortment of tools, more upright bar position...
And my speed with the two is not noticeably different. I mostly use the touring bike for practical reasons, but the road bike feels great for shorter rides.
I also have a hardtail MTB, currently wearing minimal-tread Sport Contact tyres for summer use on hard-ish surfaces, and my speed on that is only a couple of mph slower. The real difference with this is that I feel tired earlier, and around 40-50 miles is probably my limit with that bike when I can manage up to 100 on the tourer.
The bottom line for me is that for most recreational cyclists, there's far less practical difference between different bikes than the marketing business wants us to think. My last group ride, for example, included people on cyclocross, hybrid, my "city" MTB, full-on knobbly MTBs, and a Brompton. And we had a great day out.