That chart seems right. I know I have to put in extraordinary effort to maintain anything above 16 mph. And rides like that now take longer recovery times. So I'm just taking it easy and riding for distance this week, getting in saddle time, leading up to Sunday.
Nope, no bikey looking tighty roadie gear. I do wear the polywhatever wicking tech fiber stuff because it's comfy, summer and winter. But I wear baggie shorts, casual fit solid color jerseys with no logos or racing stripes, that sorta thing. When it's cold enough I wear ordinary gym type sweatshirts or zip-ups. I'm not fast enough to benefit from anything fancy. The only cycling over-gear I have is a Shimano Storm Jacket for rain, which is very good and I've used it several times this year including last week during a nighttime ride home under a downpour.