I have 2014 Prius two at 290
I have 2014 Prius two at 290 k miles it started misfire in cylrnder 1 , I cleaned manifold intake , fuel injector , plugs nothing worked and finally used Bars head gasket sealer and that $40 investment solved the problem and now I have driven 10000 miles after that and it's running great so far 299400 miles today .