I don't believe that there is a distributor, at least not a high voltage one as there is on most other cars. I don't believe that the ignition coils could berconditioned other than claening or replacing them. The spark plugs are indexed (labeled A, B, or C so that when they are tightened the metal contact faces in the correct direction) and the contacts are iridium. They are supposed to last many times longer than a normal plug. I think the service interval is over 100,000 miles. Just get the connectors back on the correct ingnition coils or the engine will not start, or will try to run on one cylinder!. That is true for any engine. If you have the plugs out you could do a compression test, and check the colour of the plugs to see if the engine is running hot or rich. If the compression is bad it could indicate a piston ring problem or a valve problem. If everthing looks good then low mileage could be caused by injectors, oxygen sensor, or something else related to fuel delivery. On a hybrid low mileage is sometimes attributed to a bad 12 volt battery placing a constant drag through the IMA system. Try pushing the car on a level surface to make sure you don't have a dragging brake shoe or pad.
If you don't want to get into heavy diagnostics, a new 12 volt battery, some injector cleaner in the gas, a new set of plugs, and some extra air in the tires might help.
If you want to go deeper into this you should have a shop manual and a friend who has basic tools, spare time, and decent place to work on the car. Working on a car without the shop manual is like working on a circuit without a schematic. (difficult, time consuming, and risky)
I'm not trying to disuade you but rather hoping that your experience will be a good one.