I bought a 2010 Prius with 160k miles on it three years ago, currently ~ 210,000 mi. When I first got the car I got 44-46 MPG (I live in the mountains, but I would sometimes get 50 or a little better when going down into the Central Valley or Bay Area). I now am getting 35-38. I have been reading the forums and have conducted the following: Replaced hybrid battery with a new one from Greentech Auto in Sacramento Cleaned intake manifold, EGR tube, and replaced EGR cooler with a used, clean one Replaced PCV valve replaced MAF sensor Run BG 44k fuel injector cleaner about 4 times (this causes a 1-3 MPG increase for the treated tank then goes back down) I also had significant problems with oil consumption which I believe is to do with clogged piston rings. Every time I change my oil I run the BG oil cleaner for 10-30 minutes. This has dramatically reduced oil consumption and I went from burning a quart every 1,000-1,5000 miles to now only burning about half a quart to a quart over a 5,000 mile oil change. Don't know if this is relevant information or not. In the future I will also be running Valvoline Restore and Protect to try and help address this issue. I have also replaced the tires with not hybrid specific tires. I am aware that this may affect the mileage a little but I didn't notice a large drop from when I got them. It was getting mid to high 30s before and after the new tires. Not sure how much this matters. How can I get back up to where I was when I got the car? Should I check check compression? See if the injectors need a cleaning or replacement? Appreciate any insight. Cheers
you can clean the throttle body get a free load test of the 12v at most auto parts stores, and I've read that oil burning can clog the cat, but idk how to check it, or if it can affect mileage. make sure tires pressure are good. are the air and cabin filters clean? sparks replaced at 120k?
Thanks for the reply, I appreciate you. Guess I forgot about doing some of this stuff, but I cleaned the throttle body, it has a new battery as of a year ago, air and cabin filters replaced 1 year ago, spark plugs replaced 20k miles ago. I keep tire pressures at 35-40 PSI. I would think a clogged cat would show a code? I've seen that issue on mine and other's cars and it's always thrown a code. Only code I've got is for TPMS sensors and sometimes a vacuum leak code shows up but it doesn't stick around for long and always goes away shortly.
