I've got an almost new chain, but forgot to oil it before today's ride. It would probably have been fine except for repeated dunkings in muddy water early on. Later in the ride it developed a noticeable squeak. Although I carry oil, I didn't particularly want to add oil on top of filth, and couldn't really be bothered (an ill-judged route led to a fair bit of walking/wading so time and cold were both sub-optimal).
But in hindsight, could stopping to oil the chain have actually got me home sooner? Was I wasting loads of power?
I ask in a general sense, but my setup is Sora 3x9, on a heavy tourer (and not very aero with extra bottles on the forks).