My understanding is that these numbers (try to) account for actual real world usage rates. Actual emissions will of course depend on a whole lot of things, incl

My understanding is that these numbers (try to) account for actual real world usage rates. Actual emissions will of course depend on a whole lot of things, including the things you mentioned, prevailing winds, etc. Same for estimating grid emissions for charging the car of course - the exact mix of sources is always in flux.