View Single Post
Old 10-05-2008, 03:40 PM   #58 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,532

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,082
Thanked 6,978 Times in 3,613 Posts
Quote:
Originally Posted by jamesqf View Post
So does it? I don't know, since I haven't driven an EV enough to say from experience. But if so, I'd like to know why.
It's true.

1) Electrical resistance increases with current. So all else being equal, accelerating rapidly is less efficient than turtlefooting it. Ohm's law - Wikipedia, the free encyclopedia

2) Also, the faster you draw energy from a lead acid battery (don't know about other chemistries), the less total energy (capacity) you get from it. Peukert's law - Wikipedia, the free encyclopedia

So to maximize efficiency (range) in an EV, accelerate gently, keep top speed down, drive with load, and coast to stops.
__________________
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote