Obviously a major factor is how long bots spend charging; I can't seem to find any figures on how long it takes a Roboport to fully charge a bot - does anyone have this info?
the 'Recharge Rate' figure on the wiki just seems to be a power consumption figure rather than a 'Bots receive # KW/s'-type figure...
Also am I right in thinking that bot energy consumption is calculated on a per tile basis rather than a per second basis? I.e. if you've got bot speed upgrades, it will get from A to B faster, but use the same amount of energy?
And do we have any stats for how fast bots fly? I suppose I could measure that, but my circuit-foo isn't quite good enough yet

Thanks