LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

what kind of hwy mpg can I expect with DoD back on?

Thread Tools
 
Search this Thread
 
Old 03-11-2012, 12:32 PM
  #1  
Teching In
Thread Starter
 
shafferdb's Avatar
 
Join Date: Aug 2009
Location: Pittsburgh PA
Posts: 18
Likes: 0
Received 0 Likes on 0 Posts
Default what kind of hwy mpg can I expect with DoD back on?

Hey all, I have a 2006 SS that the previous owner had shut off the DoD. If I turn it back on what can I expect to get on the highway? With it off I am getting 20-22mpg highway. I am driving about 200 highway miles per day for work and it would be great if I could keep the SS.
Old 03-11-2012, 01:24 PM
  #2  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by shafferdb
Hey all, I have a 2006 SS that the previous owner had shut off the DoD. If I turn it back on what can I expect to get on the highway? With it off I am getting 20-22mpg highway. I am driving about 200 highway miles per day for work and it would be great if I could keep the SS.
You can expect about from 26-maybe even 30 mpg. I was getting about 27 mpg highway with cruise control on
Old 03-11-2012, 01:33 PM
  #3  
Teching In
Thread Starter
 
shafferdb's Avatar
 
Join Date: Aug 2009
Location: Pittsburgh PA
Posts: 18
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks so much. That would be great. Can the dealer flash that back to stock? The car didn't come with the tuner.
Old 03-11-2012, 01:49 PM
  #4  
Teching In
 
blueguy's Avatar
 
Join Date: Nov 2011
Posts: 12
Likes: 0
Received 0 Likes on 0 Posts
Default

Depends on your highway speed. If I'm on the back roads and going about 60 MPH, I can stay pretty consistently around the 30 MPG area. Freeways though around 70-75, it drops off a lot to about 23-24 MPG.
Old 03-11-2012, 03:33 PM
  #5  
TECH Addict
iTrader: (15)
 
LS1 Racing's Avatar
 
Join Date: Aug 2002
Location: 78°14′46″N 15°27′56″E
Posts: 2,419
Likes: 0
Received 5 Likes on 5 Posts

Default

Our Impala lost 2 MPG highway with DoD turned off and picked up about 1 MPG in town.

Since our car gets about 1000 miles per week, highway, it hurts, but at least it doesn't smoke anymore.
Old 03-11-2012, 05:45 PM
  #6  
Staging Lane
 
straitchev's Avatar
 
Join Date: Aug 2011
Posts: 62
Likes: 0
Received 0 Likes on 0 Posts
Default

I run at approx 70mph for 45 mins each way to work and run about 27mpg with DoD on. Keep in mind, the longer the DoD is on, the more likely you are to burn oil. Your call on what is most important, the savings between a motor running low on oil or saving 2-3 mpg.
Old 03-11-2012, 08:46 PM
  #7  
TECH Resident
iTrader: (3)
 
ImpSS07's Avatar
 
Join Date: Feb 2009
Location: Houston, Tx
Posts: 933
Likes: 0
Received 0 Likes on 0 Posts
Default

My highway mileage didn't change when I turned off DOD. It's always been around 26-28mpg.
Old 03-11-2012, 08:55 PM
  #8  
TECH Apprentice
iTrader: (1)
 
BlackImpSS's Avatar
 
Join Date: Feb 2012
Location: Peru, Illinois
Posts: 306
Likes: 0
Received 0 Likes on 0 Posts
Default

Just took a 430 mile trip to Minnesota and the first tank I got a hand calculated 26.8 mpg traveling bw 75-85 mph.
Old 03-11-2012, 10:20 PM
  #9  
Staging Lane
 
TheBlizzard's Avatar
 
Join Date: Sep 2011
Posts: 87
Likes: 0
Received 0 Likes on 0 Posts
Default

Leave it off. Your oil, transmission, and ears will thanks you. MPG loss is negligible when you average it all out, mines off and I would never turn it back on, especially for the $30 a year you save on gas.
Old 03-11-2012, 10:36 PM
  #10  
LS1Tech Sponsor
 
06MonteSS's Avatar
 
Join Date: Dec 2005
Location: CT
Posts: 2,927
Likes: 0
Received 10 Likes on 10 Posts

Default

yeah, keep it off....

and the mileage people are quoting, that's looking at the instant mpg... the instant mpg is useless to go by.... it's not taking into account city/town driving, and that's not true lifetime/overall mpg...
__________________
06MonteSS / DiabLew Tune

2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Old 03-11-2012, 11:14 PM
  #11  
TECH Addict
iTrader: (15)
 
LS1 Racing's Avatar
 
Join Date: Aug 2002
Location: 78°14′46″N 15°27′56″E
Posts: 2,419
Likes: 0
Received 5 Likes on 5 Posts

Default

Originally Posted by 06MonteSS
yeah, keep it off....

and the mileage people are quoting, that's looking at the instant mpg... the instant mpg is useless to go by.... it's not taking into account city/town driving, and that's not true lifetime/overall mpg...
C'mon Lew, you know me better than that...All of my mileage is calculated fillup-to-fillup...No DIC used at all.
Old 03-12-2012, 10:14 AM
  #12  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by 06MonteSS
yeah, keep it off....

and the mileage people are quoting, that's looking at the instant mpg... the instant mpg is useless to go by.... it's not taking into account city/town driving, and that's not true lifetime/overall mpg...
I never really understood why people actually turned it off. I thought we would be saving about 14% of fuel with it being in 4 cyl mode. But I see people are actually getting better mileage without it?
Old 03-12-2012, 11:41 AM
  #13  
TECH Addict
iTrader: (15)
 
LS1 Racing's Avatar
 
Join Date: Aug 2002
Location: 78°14′46″N 15°27′56″E
Posts: 2,419
Likes: 0
Received 5 Likes on 5 Posts

Default

You get better city mileage with DoD off, but highway mileage suffers.
Old 03-13-2012, 10:48 AM
  #14  
TECH Resident
iTrader: (3)
 
ImpSS07's Avatar
 
Join Date: Feb 2009
Location: Houston, Tx
Posts: 933
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by 06MonteSS
yeah, keep it off....

and the mileage people are quoting, that's looking at the instant mpg... the instant mpg is useless to go by.... it's not taking into account city/town driving, and that's not true lifetime/overall mpg...
I don't look at the DIC instant crap. If I did then I'd be getting 60mpg at certain times!!! My 26mpg was based off a 300+ mile trip done on my manually calibrated hand calculator!
Old 03-13-2012, 11:22 PM
  #15  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default

I'm such a newb but how would you be able to tell manually? I normally just reset it back to 0 when I fill it up
Old 03-14-2012, 12:35 AM
  #16  
Staging Lane
 
TheBlizzard's Avatar
 
Join Date: Sep 2011
Posts: 87
Likes: 0
Received 0 Likes on 0 Posts
Default

Reset your mileage trip to zero, fill up, then when you need gas fill it up again and take the miles you drove divided by the gallons of gas you put back in it.

Example: Full tank of gas and you drive 365 miles, you fill up and the car take 16.5 gallons of gas, you take 365/16.5=22.12mpg.
Old 03-14-2012, 10:36 AM
  #17  
TECH Enthusiast
iTrader: (3)
 
Brian396's Avatar
 
Join Date: Aug 2007
Location: Ottawa IL
Posts: 749
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by TheBlizzard
365/16.5=22.12mpg.
Wow those are some odd numbers you used in your example? A lil more relevant 220/16.5=13.33
Old 03-14-2012, 11:18 AM
  #18  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default

Yeah so I'm seeing 18.6 miles to the gallon. Not bad when its mostly city driving. When I take my bi weekly trips to Delaware I'm seeing 330 miles to the next fill up in seeing 20 mpg. Not too bad
Old 03-14-2012, 11:34 AM
  #19  
TECH Regular
iTrader: (1)
 
lVloses's Avatar
 
Join Date: Mar 2012
Location: Lincoln, NE
Posts: 462
Likes: 0
Received 3 Likes on 3 Posts
Default

Took a 400ish mile trip on Monday, with DoD on going 75-80 I was averaging 25.3mpg. Made it all on one tank too. In town I get anywhere from 17.5-18mpg. I calculate all of this at the pump. I'm running 91 in my GXP with CAI intake if that helps at all.




All times are GMT -5. The time now is 07:24 PM.