View Single Post
Old 08-27-2009, 12:09 PM   #13 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,056

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

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 58.34 mpg (US)
Thanks: 3,704
Thanked 6,511 Times in 3,373 Posts
I think we'd have to distinguish between close drafting, and "less-close" drafting.

If you're close enough to physically occupy the low pressure zone behind the lead vehicle so flow off its top & sides attaches to the front of the following car, then both may benefit.

But if the following car is simply driving in the detached/turbulent wake of the lead car, as I believe the BMW was doing a couple of car lengths back) then it's still enjoying some benefit (yes, a smaller one than the bumper to bumper scenario), but in that case the lead car would see no gain.
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
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