Hybrid Car – More Fun with Less Gas

Frustrated prius believer question - Page 3

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Posted by richard schumacher on December 27, 2006, 9:16 pm
 




No!  When not moving you get *zero* MPG.  The first thing a Prius engine
does is run continuously, to warm up itself and the catalytic convertor;
it does this to minimize hydrocarbon emissions.  You might as well be
moving while it does this.  

The best way to warm up any car (including a Prius) is to drive it,
gently for the first few minutes.  When the cabin heater starts working
then it's warmed up.

Posted by Rich on December 28, 2006, 6:09 pm
 



richard schumacher wrote:

Gotcha...I thought that too, but you never know.

I still wonder if I need the car serviced though...when I first got the
car, the engine would shut off much faster when I stopped, now
sometimes it doesn't shut off at all, especially at stop signs.  I used
to slow down, and feel the engine turn off and I'd coast on batteries,
then accel. on batt and continue to run on them for a while...now, it
seems when I accel. from a stop sign the engine almost immediately
starts, or at least more frequently than I ever recall.  And I can tell
you truthfully that I am making an effort to not push the accel. to
much to "test the waters," but no difference.

Thoughts?


Posted by Rich on December 28, 2006, 6:09 pm
 


richard schumacher wrote:

Gotcha...I thought that too, but you never know.

I still wonder if I need the car serviced though...when I first got the
car, the engine would shut off much faster when I stopped, now
sometimes it doesn't shut off at all, especially at stop signs.  I used
to slow down, and feel the engine turn off and I'd coast on batteries,
then accel. on batt and continue to run on them for a while...now, it
seems when I accel. from a stop sign the engine almost immediately
starts, or at least more frequently than I ever recall.  And I can tell
you truthfully that I am making an effort to not push the accel. to
much to "test the waters," but no difference.

Thoughts?


Posted by richard schumacher on December 29, 2006, 6:01 am
 



Is the weather 20 degrees colder now than when you first got the car?  
When did you last check the tire pressures?

If all operating conditions are truly unchanged, then yeah, might as
well have a dealer check it out.

Posted by mrv@kluge.net on January 3, 2007, 10:35 pm
 


richard schumacher wrote:

note that tire pressures will drop 1psi for each 10^F drop in outside
temperature...  so if it was a hot summer day when you last checked
your tire pressures, and it is a chilly winter day now, your pressures
are likely down.


Well, assuming that the length of trip and type of terrain hasn't
changed, and that the type of fuel hasn't changed (many areas are now
using E10 or a winter blend, and some gas stations offer higher-octane
fuel than others for the same advertised grade), there's always the
question about the interior temperature settings and front windshield
defroster use...  Heater is run off of "waste" heat from the gasoline
engine (and yes, the engine will run just to provide  you with more
heat).  The front defroster uses the AC compressor to dehumidify the
air blown at the windshield, and that AC use gets its power from
somewhere (and doesn't light the AC light to tell you the AC is being
used)...  On a NHW11 Prius the AC is belt-run off of the gasoline
engine, causing the engine to run more often.  On a NHW20 Prius the AC
is electrically-driven off of the hybrid battery, but then the engine
may come on to recharge the battery...


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