80/20 gameplay(with roleplay elements) and pure roleplay.
In my sessions, it depends a lot on player interest and plot importance. If they want to abstract finding cheaper fuel on a routine stop, I'm not going to make them roleplay a haggle with a merchant. It's a dice roll or two, and then we move on.
However, if they're negotiating a weapons shipment to insurgents who are paranoid about spies, good roleplaying comes to the fore. One wrong move, and the entire place descents into a bloodbath...