View Single Post
Old 03-10-2010, 12:49 PM   #2 (permalink)
DonR
Master EcoModder
 
Join Date: Mar 2009
Location: Northeast Ohio
Posts: 269

The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

Little Outback - '02 Subaru Impreza Outback Sport
Thanks: 0
Thanked 16 Times in 16 Posts
According to my Scanguage II, my 3.0l Mitsubishi uses about .45 gph idling in drive once warm. In Neutral it uses 0.35 gph.

My initial thought on the subject is that by slowing down the engine it would use less fuel. Which is probably applicable to carburators, not sure.

New cars with Idle Air Control valves try to keep a constant idle rpm. So when you load the engine down in gear, it opens a small secondary throttle & gives it more go juice.

This is only my thoughts, if they are wrong, someone please correct me.

Don
  Reply With Quote