If the Driver knew...
...that Bernie was going to kill him as soon as he gave up the location of the money, why didn't he strike Bernie first? It's implied that he knows what's going to happen. Why'd he wait to show him money and allow himself to be stabbed first? Seems a bit clumsy from a guy who's been very observant and good at thinking on his toes throughout the movie.
He leaves Bernie's dead body and the money for the mob to find. He could have had the same result, minus the nearly fatal stab wound, if he killed Bernie as soon as they set foot in the parking lot, don't you think?