I hookup an OBD2 tester on my Prius 2014 Plugin and saw the OBD2 P0300 - Random Misfire. I did a reset and the error still came on. I also tested my friend Prius 2014 Plugin which is factory stock and had the same error. Wonder if that is by design or not. Going to take my ride into the dealer on Friday for my 25K maintenance and have them look into that error. P0300 can be anything. Hopefully doesn't cause more problems down the run OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected
Nope. My MPG still normal. I get around 55MPG. Ride normal. Test your if you can see any errors. It's under history stored