Hybrid Car – More Fun with Less Gas

Question about MPG - Page 11

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Posted by Bob Wilson on August 17, 2006, 9:39 am

Actually quite a few. One of the problems with an idling engine is the
drop in exhaust gas temperature cools the catalytic converter. When the
catalytic converter gets too cool, it doesn't work.

By turning off the engine, the catalytic converter remains at
operational temperatures, it isn't cooled by idling exhaust gas. This
keeps the emissions low.

Bob Wilson

Posted by Michelle Steiner on August 14, 2006, 3:47 pm

The Prius doesn't use a trip computer; it measures the gas being
injected into one cylinder, multiplies that by four, and divides it into
the miles travelled.

So?  Diesel is dirty; it pollutes.  There are a number of states
(California, and most New England states, and New York) in the US where
the sale of diesel automobiles, SUVs, pickups, and mini-vans is
prohibited because of that.

Stop Mad Cowboy Disease:  Impeach the son of a Bush.

Posted by Steve Pardoe on August 14, 2006, 4:59 pm

Ummm, using a computer to calculate and display all this?

I'm afraid you're out of date.  "Euro IV" standard diesels are exceptionally
clean-burning, have multiple catalysts, and many new cars have particulate
traps.  The lower CO2 emissions outweigh the slight (inevitable) increase in

And also impractical because there is no infrastructure for fuelling
millions of passenger cars with diesel?  Surely the real problem is that our
American friends have only recently come to appreciate the true cost of
hydrocarbon consumption (political as well as economic and environmental)
and haven't woken up to diesel for cars yet.  That's also the main reason
why the Prius has a gasoline engine.  Believe me, you will wake up, and
diesel hybrids will come.

Something we can agree on!


Posted by Bill on August 14, 2006, 6:33 pm

Yes and no.  Extensive reporting yields a couple of percent difference
between the computed mileage and the actual mileage.  Tire diameter changes
with tread wear contribute to errors in both computed and manual
calculations.  Fuel pump pressure variations contribute to errors in the
computed mileage.  Frankly, both methods are so close as to render further
discussion pointless.

They are certainly welcome to sell these in the U.S. once they meet
California's strict emission standards.  Haven't reached that point yet.

I would estimate 95% of our service stations have diesel pumps.  Our
trucking industry is about 100% diesel.  There are lots of diesel pickup
trucks on the road and some diesel cars.  Where I live, gas was $.99 and
diesel was $.19 when I last filled my Prius.

Posted by Michelle Steiner on August 14, 2006, 8:05 pm

But not a "trip computer".

The infrastructure is there; a service station less than three miles
from my house sells diesel.  There are diesel trucks that travel all
over the country, even in states where diesel cars, SUVs, mini-vans, and
pickups are lot allowed to be sold.  There are service stations that
sell diesel to them and to those cars, etc., from out of state traveling
through the state.

Stop Mad Cowboy Disease:  Impeach the son of a Bush.

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