Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 01-03-2013, 02:47 PM   #11 (permalink)
The PRC.
Join Date: Oct 2009
Location: Elsewhere.
Posts: 5,304
Thanks: 285
Thanked 534 Times in 383 Posts
Drafting at a safe distance can give quite a big benefit because it allows you to go slower. If I go slow (say 60 in a 70) then I can fine people not noticing the speed difference and coming up really fast before a "last minute avoid" lane change. If I put myself behind something obviously big and slow then this doesn't happen.

I also use the "2 second rule" to avoid piling into the back of anything, but also being that little bit further back means you can see "round" the vehicle in front more which means you can see obstacles quite a way ahead.

[I]So long and thanks for all the fish.[/I]
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 01-03-2013, 03:05 PM   #12 (permalink)
Master EcoModder
freebeard's Avatar
Join Date: Aug 2012
Location: northwest of normal
Posts: 10,232
Thanks: 2,273
Thanked 3,231 Times in 2,543 Posts
Originally Posted by doclees
Any closer and may as well be towed. Rocks, blown tires, eh. What, you want to live forever? Keeps your reflexes sharp.
Back in the 80s I was following a dump truck at approximately a legal interval, when I observed a rock about the size of my fist that was stuck in its rear dual tires dislodge and bounce off my hood directly in front of me. Fortunately it bounced sideways, and knocked the outside rear view mirror right off the car. So in a sense, I am already living forever.
  Reply With Quote
Old 01-03-2013, 03:41 PM   #13 (permalink)
Join Date: Dec 2011
Location: Canton CT
Posts: 442
Thanks: 140
Thanked 41 Times in 31 Posts
the best way I found to gauge distance is watch as the debris , leaves etc, get carried along in the trucks wake, if your there your good, can be a pretty fair distance, also someone mentioned buffeting another good indicator , roll down your window and when you feel the air popping in and out of the car ,I think your drafting . either way you've got to stay glued to his brake lights for reference, and if he should crash, you do too. most likely. probably works better on a pickup than anything, I've actually felt gains when someone tailgates me with the right shaped car, can't remember what kind but it happens.
  Reply With Quote
Old 01-03-2013, 04:15 PM   #14 (permalink)
Efficiency Aficionado
CigaR007's Avatar
Join Date: Jul 2010
Location: Province of Québec
Posts: 605

GreenTurtle - '01 Toyota Echo Sedan
90 day: 44.85 mpg (US)

Zulu - '14 Honda CR-Z
90 day: 39.58 mpg (US)
Thanks: 135
Thanked 133 Times in 92 Posts
Here is a video of a tuft testing I did a few months ago. Notice at 3:10 how the airflow is somewhat attached (center of rear glass) and becomes very turbulent and detached when I stop drafting the bus in front of me.

  Reply With Quote
The Following User Says Thank You to CigaR007 For This Useful Post:
radioranger (01-03-2013)
Old 01-03-2013, 07:20 PM   #15 (permalink)
Join Date: Sep 2012
Location: Nashville, TN
Posts: 144

CLaero - '97 Acura CL Premium
90 day: 34.59 mpg (US)

CR-v - '03 Honda CR-V EX
Team Honda
90 day: 26.52 mpg (US)
Thanks: 9
Thanked 21 Times in 21 Posts
Originally Posted by doclees View Post
Tankers are best.
I've found this to be true in my car, while in my truck, the trailers that have those "Kamm wings?" On them netted the best FE
'97 Acura CL 2.2L 5spd
'03 Honda CR-V 2.4L EX 4wd Auto
  Reply With Quote
Old 01-04-2013, 01:35 PM   #16 (permalink)
Rat Racer
Fat Charlie's Avatar
Join Date: May 2011
Location: Route 16
Posts: 3,008

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,030
Thanked 1,150 Times in 744 Posts
Safe following distances change depending on speed, weather, time of day, traffic, etc. I wouldn't get closer to something just because I'm drafting it, in fact I'll generally give it at least as much distance as I would a car because a good truck is hard to see through. If it's big enough to be worth drafting, it's punching a big enough hole in the air that you can do it from a safe distance. Besides, P&G won't let you pick an exact distance anyway.

The worse your car's aero, the more drafting will help. I find that I can get an mpg boost if the rig is going at my speed, and I can hang on to one going around 10 mph more than I want to go without hurting that trip's numbers- but I've found that trying to catch up with one isn't worth it.

I draft a lot less than I used to, but I think that's because I'm pickier about drafting opportunities than I was.

Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Old 01-04-2013, 06:16 PM   #17 (permalink)
B.O. Zen
Join Date: Feb 2009
Location: Folsom, CA
Posts: 204

Pickup - '99 Toyota Tacoma 2wd, Regular Cab, Short Bed
90 day: 34.62 mpg (US)
Thanks: 129
Thanked 133 Times in 57 Posts
I agree about the heavy traffic "drafting". Some of my best mpg has been from 25-45MPH speed-up then slow-down traffic on the freeway.

  Reply With Quote
Reply  Post New Thread

Thread Tools

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com