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Re: [Phys-l] Hybrid mileage

My prius mileage is not close to advertised and drops substantially in the winter. I think it is mostly due to what Rick mentions below. I only have less than a half mile commute to work; so a lot of my miles are never out of the initial engine warming up stages at high revs.


Joel Rauber, Ph.D 
Professor and Head of Physics
Department of Physics
South Dakota State University
Brookings, SD 57007
605.688.5428 (w)
605.688.5878 (fax)

-----Original Message-----
From: [mailto:phys-l-] On Behalf Of Richard Tarara
Sent: Tuesday, January 05, 2010 6:15 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Hybrid mileage

I have noticed that the engine seems to be reving higher, at least for
first ten minutes or so--guess I could check the Tach, but with an
I never paid much attention this summer (new car) so I don't have a
reference point.


From: "Shapiro, Mark" <mshapiro@Exchange.FULLERTON.EDU>
Sent: Tuesday, January 05, 2010 4:44 PM
To: "Forum for Physics Educators" <>
Subject: Re: [Phys-l] Hybrid mileage

In order to meet emission requirements the cc has to be at a certain
minimum temperature. A sensor monitors the cc temp and tells the
computer to run the engine at high enough rpms to bring the cc up to
For a hybrid that may mean going from zero rpms to finite rpms. For
non-hybrid that may mean increasing the idle speed.

(These days you don't "drive" a car, you just point it. The computer
drives it!)


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