My Prius is down 4 quarts of oil 9000 miles after oil change

Not even remotely close. You're thinking of the roughly 14-15 pounds (or other mass unit of your choice) of air per pound of gasoline. A pound of air occupies a lot more volume than a pound of gasoline.

 

He's probably referring to stoich air fuel ratio 14.7:1

 

2010 gen3 210k on the clock.....6k done from last service and the low oil warning light keeps coming on everytime already when I go around a roundabout or when I brake hard.....JUCYYYYY lol

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Is been the same from the past 60k...It burns alot of it ...can the pcv valve been not working?

Why the duplicate posts ??

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The warning is "low oil pressure", but it is pretty much synonymous with low oil level. Have you been regularly checking and topping it up?

How many miles again? I recall you were having your share of woes, just can't remember the particulars.

 

when the oil light comes on the pressure is way low & the oil level is already low low //

 

+++++1 on that. I've had the wonderful experience a few times of checking oil on different cars and there's nothing on the dipstick, but still not low enough to trigger the warning light.

About 10 years back, I purchased an old 1975 right hand drive postal jeep from a seller in St Louis. Towed it back to Columbia, SC using my old reliable 1995 F150 with 260+k miles on it, a 300 I6 and dual fuel tanks. The mountains were tough on that poor engine. When I got local, I stopped for gas. I turned down the radio and all I could hear was a loud clacking noise. Uh-oh....checked the oil and oops. Took 3.5 quarts to get back in the lines. Found that all the piston ring blow-by had actually popped the oil pan gasket out over a section about 4 inches long. The front of that jeep and the U-haul tow dolly were very well lubricated. Thought for sure she was a goner. The truck didn't even blink and is still going today with 290k. Just put a new battery in it about a month ago.

 

The car as 210k on the clock,it started consuming oil from when it was at around 160k..... I now do a full change of oil at about 7k to 8k .

Other problems are a rattling sound at low speed on acceleration from somewhere under the engine or the back of it ,it sounds like a diesel car noise if you know what I mean,it goes mostly away if I unplug the egr valve.

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The low oil pressure light should not be used as a reminder to add oil. It should be viewed as an alert that the engine is experiencing irreparable damage due to oil starvation.

 

Other problem ? Seems like its more than just other problem.
many of us had this other problem . ended in replacing head gasket.