162 and R20 smelling bubbles ?

based on recent 2 formula races in Portugal and Sopot, starboard formula board 162 seems to be at tail-end of glory.
read that those guys used R20 for barbeque fire..


162 is much slower than 161, vapor or F2 ?

how about R20 ?
everyone is not using it, all on kashy, C3, VMG or some unknown designs.