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#4667535 - 02/16/18 08:21 AM Do you draft semis?
Iowegian Offline


Registered: 01/05/17
Posts: 273
Loc: Iowa
Do you draft semis?
How close?
Mpg savings you get?

https://www.treehugger.com/cars/drafting-behind-trucks-does-it-work.html

So I tried it a little today on the interstate. 20 mph head wind.
My instantaneous mileage readout showed an increase from 18 mpg to about 23 mpg at 70 mph.
2011 equinox.
Not sure how close I was but certainly further than 100 feet.

Semi drivers? Care to opine? whistle


Edited by Iowegian (02/16/18 08:32 AM)
_________________________
2011 Equinox, 2.4l
2009 Sienna, 3.5l

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#4667538 - 02/16/18 08:26 AM Re: Do you draft semis? [Re: Iowegian]
4WD Offline


Registered: 09/21/10
Posts: 6538
Loc: Texas
Originally Posted By: Iowegian
Do you draft semis?
How close?
Mpg savings you get?

https://www.treehugger.com/cars/drafting-behind-trucks-does-it-work.html

So I tried it a little tosay on the interstate. 20 mph head wind.
My instantaneous mileage readout showed an increase from 18 mpg to about 23 mpg at 70 mph.
2011 equinox.
Not sure how close I was but certainly further than 100 feet.

Semi drivers? Care to opine? whistle


Nope but many moons ago my brother had a VW van while attending the University of Texas by the time it got a bit hilly heading for Austin you had to draft a truck to do 60 mph wink

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#4667541 - 02/16/18 08:28 AM Re: Do you draft semis? [Re: Iowegian]
onemig Offline


Registered: 07/09/12
Posts: 200
Loc: MD
I don't to avoid rock chips.
_________________________
2014 Subaru Forester XT Touring w/ Eyesight, 80K miles - Wife's

2017 GTI S DSG 4 Dr. HB, 5K miles - Mine

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#4667548 - 02/16/18 08:33 AM Re: Do you draft semis? [Re: Iowegian]
WyrTwister Offline


Registered: 01/13/13
Posts: 1584
Loc: Texas
No .
_________________________
Wyr
God bless

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#4667550 - 02/16/18 08:33 AM Re: Do you draft semis? [Re: onemig]
Iowegian Offline


Registered: 01/05/17
Posts: 273
Loc: Iowa
Originally Posted By: onemig
I don't to avoid rock chips.

Good point
_________________________
2011 Equinox, 2.4l
2009 Sienna, 3.5l

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#4667551 - 02/16/18 08:34 AM Re: Do you draft semis? [Re: Iowegian]
SVTCobra Offline


Registered: 12/11/09
Posts: 713
Loc: Battle Creek, MI
I don't have a digital read out of MPG on my truck but when towing big wind drag items like hay I can tell a huge difference. Usually my F-150 doesn't have the power to tow any high profile items like hay at 60 mph in overdrive.
When an 18 wheeler passes me, usually my truck can gain 5 mph in OD, so I know it helps with wind load a lot, but usually the eddies coming from the back the truck makes the truck feels unstable so I usually don't follow close enough to gain any real benefit.
_________________________
If marriage was outlawed only outlaws would have in-laws.

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#4667552 - 02/16/18 08:34 AM Re: Do you draft semis? [Re: Iowegian]
pandus13 Online   content


Registered: 08/12/11
Posts: 3306
Loc: Chicago,IL,USA
It only benefited me twice:
1. down pouring rain, low visibility, really late at night. I got behind him (free carwash), but positioned myself not to blind him. He had a higher seating position, so better visibility than tired me.
2. a porkie carrier while driving trough Smokies and ATL. He passed everybody at 70+, no matter traffic or going up the mountain. or curves.
Of course in the morning guess who had a brand new crack growing in the front windshield?

So for the rest I give them the respect especially since they could kick pebbles on the road pretty quick and hard.
Also they could be tired from driving for who knows how long.
But as a group, tire truck/semi drivers beat 4-wheelers for consistency and courtesy in traffic.

Be safe out there.
_________________________
16 Golf SportWagen
13 Mazda5
08 Yaris
04 Elantra
95 accent
95 mystique
97 concorde

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#4667555 - 02/16/18 08:36 AM Re: Do you draft semis? [Re: Iowegian]
Iowegian Offline


Registered: 01/05/17
Posts: 273
Loc: Iowa
I think I will continue to try this... At a safe distance. Considering my Equinox is not the most aerodynamic, the effect will be much greater.
_________________________
2011 Equinox, 2.4l
2009 Sienna, 3.5l

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#4667556 - 02/16/18 08:37 AM Re: Do you draft semis? [Re: Iowegian]
RTexasF Offline


Registered: 10/01/02
Posts: 2901
Loc: North TX
Nope, not on a bet.

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#4667558 - 02/16/18 08:37 AM Re: Do you draft semis? [Re: Iowegian]
4WD Offline


Registered: 09/21/10
Posts: 6538
Loc: Texas
Originally Posted By: Iowegian
Originally Posted By: onemig
I don't to avoid rock chips.

Good point

At only 7K on SUV already blessed by a gravel hauler booked for a resin job next week

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#4667563 - 02/16/18 08:40 AM Re: Do you draft semis? [Re: onemig]
pandus13 Online   content


Registered: 08/12/11
Posts: 3306
Loc: Chicago,IL,USA
Originally Posted By: onemig
I don't to avoid rock chips.

^^^ this also.
Mazda5 paint is really brittle.
_________________________
16 Golf SportWagen
13 Mazda5
08 Yaris
04 Elantra
95 accent
95 mystique
97 concorde

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#4667567 - 02/16/18 08:41 AM Re: Do you draft semis? [Re: onemig]
rustypigeon Offline


Registered: 03/27/09
Posts: 211
Loc: PA USA
Originally Posted By: onemig
I don't to avoid rock chips.


I keep a good distance from vehicles ahead of me not only for safety, but rock chips.

There is a clear and definite difference in the amount of rock chips in the vehicles I drive, compared to the vehicles my wife drives. She constantly tailgates and her vehicle looks like someone sandblasted the front.
_________________________
1994 Toyota Pickup 202,000mi
1999 Mazda Protege 220,000mi
2000 BMW 323i 126,000mi
2005 Toyota Highlander 180,000mi

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#4667573 - 02/16/18 08:47 AM Re: Do you draft semis? [Re: rustypigeon]
Iowegian Offline


Registered: 01/05/17
Posts: 273
Loc: Iowa
Originally Posted By: rustypigeon
Originally Posted By: onemig
I don't to avoid rock chips.


I keep a good distance from vehicles ahead of me not only for safety, but rock chips.

There is a clear and definite difference in the amount of rock chips in the vehicles I drive, compared to the vehicles my wife drives. She constantly tailgates and her vehicle looks like someone sandblasted the front.

I don't tailgate....I pass em! grin
_________________________
2011 Equinox, 2.4l
2009 Sienna, 3.5l

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#4667575 - 02/16/18 08:48 AM Re: Do you draft semis? [Re: Iowegian]
BigD1 Offline


Registered: 08/12/15
Posts: 2580
Loc: NC
If you like living, stay away from trucks, and pass them quickly as possible. The trailer tires blow up lots. I know because I blew up my fair share of them when I was driving. Blew one tractor drive tire, and not one steer tire. Recaps are used on the trailer.
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1992 Toyota Pickup--Formula Shell 10W-30--Fram PH3614

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#4667580 - 02/16/18 08:51 AM Re: Do you draft semis? [Re: Iowegian]
Smoky14 Offline


Registered: 04/23/03
Posts: 1344
Loc: Nowhere NM
Was almost out of gas and out of money returning to base from leave riding my motorcycle, latched on to a rig and got over 70MPG which got me out of trouble with my uncle Sam. The driver knew I was there and kept me out of trouble, but I don't recommend it for fun.

Smoky
_________________________
99 Acura 2.3CL 5speed MT
12 Ford Fusion 2.5S 6speed MT
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