I remember hanging out at this local shop in Denver last summer when I needed a Prius oil check. The dealer said it’s 3.75 quarts for the 2011 model. Yeah, I was low too, whoops my bad haha! Always double-check since some info online can be sketchy. Didn’t wanna run it dry again, trust. You’d think a hybrid would be automatic, but nah! Everyone’s obsessed with those eco vibes. Keep your motors happy, folks!