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Re: [Phys-l] Hybrid mileage

I have noticed that the engine seems to be reving higher, at least for the
first ten minutes or so--guess I could check the Tach, but with an automatic
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 car's
computer to run the engine at high enough rpms to bring the cc up to temp.
For a hybrid that may mean going from zero rpms to finite rpms. For a
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!)