I've lived 40km from my office, commuting by bicycle (there was an highway and a railway available as well). I was super fit at the time. I've lived 100km from my office, taking a mix of train + bicycle. Despite being a wee bit slower than using a car, I could do something ( or sleep/nap) in the train, so that was better time spent.
Anyway you look at it, even when it is faster, using a car in an area that has decent public transport is a time that is not well spent over different modes of transportation and you don't really gain time if you think of it thorously.