Hybrid Car – More Fun with Less Gas

Prius Needs Premium Gas?

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Posted by Chris Shearer Cooper on November 19, 2005, 12:35 am
 
We got a Prius about a month ago, and so far it seems like the car is
happier with premium gas.  With low-octane gas, when the gas engine shuts
off, it doesn't do so smoothly - it kind of "ka-chugs" a couple of times
before stopping.  Is this normal?

Thanks!
Chris



Posted by Bill on November 19, 2005, 12:53 am
 


Mine does that sometimes when it is cold.  I understand this is common.  I
use 87 octane and that works fine.



Posted by Chris Shearer Cooper on November 19, 2005, 1:24 am
 Cold like the weather is cold, or like right after the car has first
started?

I am pretty sure it does this for me even after the car has been running for
a while ...



Posted by Bill on November 19, 2005, 3:03 am
 

Mine had done this a few times in both winter and summer weather (I'm in
Minnesota) but to the best of my recollection, only when the engine was
cold.  Sometimes I think it has a conflict of interest:  It wants to shut
down because I'm not putting a load on it but it wants to keep running
because my catalytic converter hasn't warmed yet.




Posted by richard schumacher on November 19, 2005, 1:45 am
 

It's normal.  The engine is burning off the last little bit of gas so it
doesn't evaporate (evaporated gas being a worse pollutant than burned
gas).  Prius never needs premium; if it ever pings, it needs a repair.

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