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why prius front tire pressure higher than rear? - Page 2

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Posted by Andrew Stephenson on October 15, 2006, 12:54 am

       Tondaleo@hotmail.com "Ron Sleeter" writes:

Um.  I mis-read the pressure chart on my Prius and over-inflated
the tyres.  Fortunately, not long afterwards I happened to visit
the dealer/garage (the same that gave out champagne to compensate
for a recall's "hassle") and happened to mention the pressure I'd
used...  A strained look crossed the face of the dealer-bod, who
suggested that he take the car aside and adjust the pressure down
to what was _actually_ recommended on the chart.  He did and the
mpg stayed much the same: currently getting around 57mpgUK.  OTOH
I suspect tyre life and the safety of my ride improved.  (FWIW, I
don't have the tyre pressure tables handy.)

(BTW, 57 mpgUK == 45.6 mpgUS.)
Andrew Stephenson

Posted by perfb@yahoo.com on October 16, 2006, 6:44 pm

I read elsewhere about this use of 42 psi for mileage, but it seems to
me it would compromise safety by decreasing skid threshold in the event
of a rapid stop and/or rapid maneuver on wet roads?

Ron Sleeter wrote:

Posted by Bill on October 16, 2006, 7:10 pm

Maybe by one percent.  Proper inflation is important to minimize the
possibility of bruise breaks from hitting pot holes and stress fractures
leading to a thrown tread.  The 42/40 pressures recommended by many (I use
these pressures) are within my tire's rating.

Posted by Ray O on October 16, 2006, 7:17 pm

I have never heard of the term "skid threshold" but if you are talking about
the point at which the tires lose traction with the road surface or
something like the coefficient of friction, then the higher tire pressure
doesn't compromise safety.  There are so many variables that affect tire
performance and tire life that a change in 1 variable will be offset by
changes in others.

Ray O
(correct punctuation to reply)

Posted by Carl Powell on October 17, 2006, 4:51 am

My wife and I have noticed that the difference between the 35 lbs that my
dealer uses and the 41 I put in at the next fill-up is about the difference
between 42.x and 47.x Avg.MPG. We have never had any problem with traction.
Here in Tidewater VA we run about 60/40 interstate/street. I-64 is concrete
mostly with longitudinal drain groove cutting. (don't know if that makes any
difference or not, but it makes some nifty 'whistling' at 60 when the
pavement is new and the grooves are just put down.)

Carl Powell

"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message

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