Hybrid Car – More Fun with Less Gas

New Volt should get 230 mpg in city, GM says - Page 30

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Posted by BobG on August 17, 2009, 8:01 pm


Mile Per Gallon Equivalent is the metric being used in the Progressive
X prize contest for 100 MPG cars. Volt gets 100mi per 25KWh on
electric, 62 MPG on gas, and has a 16KWh battery pack. The computer
turns on the gas engine/generator at 30% left in the battery. Only
thing I havent been able to find out is what is the cruise speed on
gas? I assume the genny must be able to put out more than .25KWh per
mile, or it couldnt get ahead of the motor while cruising on gas. If
the computer wont let you drain the batt below 30%, then you just
floor it with the motor on, and the gennys puttin out 16KW and the
cars scootin along at 40mph using .25KWh per mile. Snoozy. I commute
70 mi one way on a 2 lane rd. I'd like it to go 70 or 80 for an hour.

Posted by Neo on August 30, 2009, 8:16 pm


The Nissan Leaf which is an 100 mile range all electric car
using a 24khw/90kw battery pack (  The Nissan Leaf
battery takes 16 hours for a full recharge using a single phase
100V @15 A current, i.e 24kwh = 100v * 15Amp * 16 hours)

that suggest to me that

Nissan Leaf getting  100 miles/24kwh

which compares
similarly to

Chevy Volts getting  100 miles/25kwh

The electric drive mode energy efficiency is about the same.
It cost me about 16 cents/ kwh (after all the taxes and surcharges)
so theoretically a full recharge for an EV in DC would cost  $.00
dollars. So a Nissan Leaf would get 100 miles/ $.00 today.
In the DC area, it currently cost cost $.60/gallon for gas.
A 2010 Prius II  (which gets about 50 mpg) should equivalent
get 100miles/$.20.

The $0,000 price differential between the Leaf and the Volt
is dependent on the value of the Volt's ability to continue
for another 300 miles using the ICE genny.


Posted by vaughn on August 30, 2009, 8:44 pm

   Interesting analysis!  But let's remember that you are comparing 2 cars
that don't really exist in their final consumer form yet and, (last I heard)
don't even have firm prices established.


Posted by Neo on August 31, 2009, 12:18 am


Since both vehicles are still in the development phase things could
change (including the price tag).  Others have come to the same
conclusion wrt to the energy cost of operating a Nissan Leaf when
compared against a Toyota Prius. While  Nissan Leaf's simpler design
makes it easier for Nissan to make a more reliable vehicle, the more
complex Volt design could be more reliable if Nissan fails to require
a hi level engineering quality in the Leaf's design and manufacture.

It is also possible to make a 100mpg gas/diesel car however
the designers must work with a different weight/power ratio
requirements - which would prevent the use of a conventional
steel body. A United Kindom company, Axon (1), has taken
this design challenge route and it has built a 100 mpg
prototype car - it uses a carbon fiber body similar to
the Indy 500 race cars to keep the weight down and protect the
occupants.  The cost to run the Axion prototype car would
be 100 miles/ $.60. which while only a 2 seater would be
about half the cost of running either the Chevy Volt or the
Nissan Leaf.  The prospects of the next generation of
cars using carbon fiber has probably steel workers shaking
in their boots....


Posted by danny burstein on August 31, 2009, 1:08 am

Honda Insights, when running at highway speeds, routinely get
sixty to seventy miles/gallon. That's a standard production car
(or was until they cancelled it).

If you "baby it" you can do even better, especially if you've
got a manual transmission.

Add in the ten years of R & D since they hit the market and you
could probably raise that 10 mpg. Switch the gasoline engine
with a diesel and you'd get another ten or so.

Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]

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