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2010 Prius III fuel efficiency hypermiling results - Page 3

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Posted by News on December 29, 2010, 12:40 pm
 
On 12/29/2010 4:40 AM, Neo wrote:

Good luck on snow and ice with those tires and pressures.

Posted by Elmo P. Shagnasty on December 29, 2010, 12:52 pm
 


When he runs into me on the road, I'm going to take his tire pressures
and add them to the police report.  When the insurance companies start
bickering, I'm going to make sure his insurance company knows that he
was misusing the car in a dangerous way.

Not covered by insurance, trust me.

Posted by Neo on December 31, 2010, 7:53 pm
 wrote:

Raising the tire pressure has not made the car more dangerous, trust
me.

My test indicate that these the tires appear to be designed to handle
the
additional pressure and that handling and braking are the same. I
know
because I had the tires set at recommended 35/33 psi setting initially
-
and I can tell you that the braking and the handling are about the
same
for normal urban-highway driving conditions.  I've read that the
Yokohama
Avid S33 can be set to  50 psi in the front and 48 psi in the rear -
However, I have not tested this setting yet. There is about 8 mpg  to
10 mpg
FE performance improvements going from a 35 psi front and 33 psi
rear to a 44 psi front and 42 psi rear tire pressure setting when
hypermiling. However, there does not appear appear to be any
additional
significant improvement by going over that setting to  48 psi
front and 46 psi rear.


So far, I haven't seen any reports indicating insurance companies
have
any opinion on hypermiling - positive or negative. However, I don't
think
the police would easily allow you to add something to a  police
report because that would imperil their objectivity as a neutral
third
party in the eyes of the court.  I am not aware of any judicial
ruling
about under what conditions overinflation of tires can constitutes
a misuse or dangerous use of a vehicle.   However, if you have any
court papers to indicate this to the contrary I am very interested.
So far - I've seen very little substantial and rational evidence on
the
topic of tire overinflation. I've been experimenting with hypermiling
in part because - there is no way to find out what I need to know
without
experimentation. - if you could provide such information -
it would save me alot of time.


Most of hypermiling occurs as speeds lower than 40 mph, with slow
accelerations, slowly coming to a stop, yielding  to faster vehicles
and yielding to pedestrian along the way - its highly unlikely that
during this hypermiling experiment I will hit anyone.  Hypermiling
is a very passive form of driving and tends to extend the time it
takes to get anywhere.   There are alot of crazy drivers out there
but I am driving so slowly that they can easily drive rings around
me or I can get out of their way in time.




Posted by Elmo P. Shagnasty on January 1, 2011, 2:52 pm
 In article


Absolutely it changes the handling, away from what the entire suspension
was designed to be.

The tires ARE an integral part of the suspension, and in fact those
little tire patches are the only thing touching the road.

Change that, and you change the dynamics of the entire car.

Posted by Elmo P. Shagnasty on January 1, 2011, 2:55 pm
 In article


It doesn't matter if the TIRES are designed to handle the pressure.  Why
would you even incorporate that into your thinking about the dynamics of
the car?

Do you believe that all that matters is "can the tires take this"?

And you have zero idea if "braking and handling are the same".  All you
know is YOU haven't found the edge of the envelope YET.

But you aren't testing it for hundreds of thousands of miles under all
types of conditions--that is, until you meet one of those conditions
that the car SHOULD be able to handle with an average driver.

When it doesn't handle it the way it was designed to, YOU are the sole
factor at fault.  Not Toyota.

When you hit me, I will take your tire pressures and add them to the
police report.

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