Toyota Repair Problems? Ask a Mechanic for Answers ASAP
do you watch the digital screen for efficiency?
has your driving habbits change? I sted watching the monitor it drove me nuts finding the sweet spot..
read this article http://mikewithaprius.blogspot.com/2011/04/prius-ing-for-dummies-beginner-prius.html
how many miles? how is the air filter?
have you checked the plugs? are you running non ethanol fuel?