DIY Electric Car Forums banner

1 - 7 of 7 Posts

·
Registered
Joined
·
70 Posts
Discussion Starter #1
Miles per gallon claims for plug-in hybrids are always impressive.
The City of Seattle, Washington is planning to get some and is
expecting 100 mpg.
How is a miles per gallon figure calculated? It seems to me there
is no upper limit to what could be claimed. If the car were always
operated so as to never cause the ICE to start then no gasoline
would be consumed and the user could claim as high a figure as he
pleased. The fuel system could be disabled and drained and the car
could be driven 100,000 miles on zero gallons.

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #2
Currently no plug in hybrids are sold. So all current generation hybrids do
use gas, or diesel in Europe, and thus one can calculate MPG. If the Chevy
Volt does come to pass then you are correct the current calculation does not
really apply. But it seems GM is trying be truthful saying less than 40
miles, no gas, a 60 mile commute something like 150mpg and if you are on a
long trip then 50 mpg.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Tom Shay
Sent: Wednesday, October 24, 2007 7:12 PM
To: Electric Vehicle Discussion List
Subject: [EVDL] Plug-in Hybrid Miles per Gallon

Miles per gallon claims for plug-in hybrids are always impressive.
The City of Seattle, Washington is planning to get some and is
expecting 100 mpg.
How is a miles per gallon figure calculated? It seems to me there
is no upper limit to what could be claimed. If the car were always
operated so as to never cause the ICE to start then no gasoline
would be consumed and the user could claim as high a figure as he
pleased. The fuel system could be disabled and drained and the car
could be driven 100,000 miles on zero gallons.

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #3
I have my doubts that a car of that size and aero profile is going to get 50mpg on gas alone. It's just a really optimistic guess on GM's part right now.

----- Original Message ----if you are on a long trip then 50 mpg.





_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #4
Today's Prius can already do 60 MPG on the highway, while the
engine is not running in its optimal point; having the serial
hybrid setup allows you to tweak the engine to run at its best
performance and send all extra to the battery, once the battery
is sufficienty charged (say, up to 50% from 20 or 30%) then the
engine can stop entirely for another 10 miles or so EV-only
drive, then the engine can again be run at its optimum efficiency
and besides, they did not make a claim as to which *speed* they
were running at. I bet it is possible to run the Volt at 100 MPG
by choosing a low enough speed, just like Prius hypermilers can
achieve 100+ MPG by investing enough time (among other optimizations)

Luckily the proof of the pudding is in the eating, so all we need
to do is test it.... I'll go to my GM dealer and see if I can
arrange for a test drive to compare it with my Prius and my EV ;-)

Serious though - I get the strong impression that GM is aware that
it is either going to make the Volt a success, or fail completely
and disappear in the margin, so there is enough pressure on getting
the Volt to the market already.

Besides, the facts seem to indicate Peak Oil was last year, so
there will be no more concern about global warming soon.
Only about who gets the oil supply that is left.
Today: about 80 million barrel/day. In 2030: half of that.
(a decline of avg 3% per year).
So, there is little time left to change the consumption, as
the supply will unfortunately be setting the stage (and price).
See the report from earlier this week at Energy Watch Group:
http://www.energywatchgroup.org/Oil-report.32+M5d637b1e38d.0.html

Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925
Fax: +1 408 731 3675 eFAX: +31-87-784-1130
Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Glenn Saunders
Sent: Wednesday, October 24, 2007 5:01 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Plug-in Hybrid Miles per Gallon

I have my doubts that a car of that size and aero profile is going to get 50mpg on gas alone. It's just a really optimistic guess on GM's part right now.

----- Original Message ----if you are on a long trip then 50 mpg.





_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #5
> How is a miles per gallon figure calculated?

I think how Aptera is portraying it is much more realistic and
upfront. Check out http://www.aptera.com/details.php and click on the
performance tab for a graph of mpg based on different driving
distances.

--
David D. Nelson

http://www.austinev.org/evalbum/1328

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

·
Registered
Joined
·
70 Posts
Discussion Starter #6
I hope it is realistic and upfront as they indicate in the graph the LOW
expectation is 300 Miles/gal. I have a hard time believing that.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of David Nelson
Sent: Wednesday, October 24, 2007 10:06 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Plug-in Hybrid Miles per Gallon

> How is a miles per gallon figure calculated?

I think how Aptera is portraying it is much more realistic and
upfront. Check out http://www.aptera.com/details.php and click on the
performance tab for a graph of mpg based on different driving
distances.

--
David D. Nelson

http://www.austinev.org/evalbum/1328

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 
1 - 7 of 7 Posts
Top