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How to tell if DoD is working?

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Old Jul 20, 2010 | 05:37 PM
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Default How to tell if DoD is working?

Just as it says... I'm trying to gauge how much I actually use this. I drive 54 miles of interstate, 30 miles of highway and the rest city/ country road.
However I still only average 20 mpg. The open road has some elevation changes and whatnot...
Basically if I rarely use it, I'm getting rid of it.
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Old Jul 20, 2010 | 05:44 PM
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Flat roads, under 75, sounds very different. With exhaust it's a lot more noticeable.

Don't the SSes have an indicator?
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Old Jul 20, 2010 | 05:52 PM
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Originally Posted by JP_GXP
Don't the SSes have an indicator?
Yup - its a setting on the DIC
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Old Jul 20, 2010 | 05:56 PM
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Well if that's the case it would rarely be on... If that is the case good deal...

Has anyone improved mileage by eliminating DoD?
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Old Jul 20, 2010 | 05:56 PM
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What about the GXPs?
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Old Jul 20, 2010 | 05:59 PM
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Your mileage should be higher than that...unless you're dragging. I've gotten high 20's at 65-70 on cruise. We average 22 with town and climbing the "summit" everyday on way to work.

Get ahold of Lew (06MonteSS) to tune. That'll help big time.

Thanks,
Tom
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Old Jul 20, 2010 | 06:04 PM
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Originally Posted by indynotch50
Well if that's the case it would rarely be on... If that is the case good deal...

Has anyone improved mileage by eliminating DoD?

I recently (400 miles ago) had Lew write me up a tune to turn the system off. In comparision to the old tune he wrote for me (which kept it in V4 mode more often than stock), I am getting ~12% less mileage, or the equivalent of paying $0.35 more a gallon. I will run it for a few thousand miles and see where it ends up at before I decide to keep it tuned out or not. I run a lot of highway miles, so the results of someone who runs around town more often may be very different.
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Old Jul 20, 2010 | 06:15 PM
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Ah that's not cool. Yeah most of my driving is highway. If I'm very careful I can average 21.9 ~ 22.0.
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Old Jul 20, 2010 | 07:04 PM
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I do all city driving and average 13.9 mpg,but when I cruise the fwy I get about 20-21 mpg...But my car hardly see the fwy,lol...

I average at least 230 mile on a full tank,and I still have DOD ...
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Old Jul 20, 2010 | 07:24 PM
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18.8 average for the last year, almost entirely stop-and-go city driving, but with a couple of miles of freeway thrown in. (Based on my last fill, the Legacy gets 22.5 for the same commute.)

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Old Jul 20, 2010 | 07:42 PM
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Originally Posted by indynotch50
What about the GXPs?
gxp's do NOT have the 4/8 cyl mode indicator in the DIC...
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Old Jul 20, 2010 | 07:43 PM
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Originally Posted by indynotch50
Well if that's the case it would rarely be on... If that is the case good deal...

Has anyone improved mileage by eliminating DoD?
I gained 2mpg since I disabled my DOD 4.5 years ago...
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Old Jul 20, 2010 | 07:52 PM
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Does using 87 hurt the mileage??
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Old Jul 20, 2010 | 08:01 PM
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Originally Posted by 06 SS
I recently (400 miles ago) had Lew write me up a tune to turn the system off. In comparision to the old tune he wrote for me (which kept it in V4 mode more often than stock), I am getting ~12% less mileage, or the equivalent of paying $0.35 more a gallon. I will run it for a few thousand miles and see where it ends up at before I decide to keep it tuned out or not. I run a lot of highway miles, so the results of someone who runs around town more often may be very different.
correct... if you do a LOT and mostly highway driving, then DOD will help you...

if you don't then it will hurt you...

my driving is 50/50 town/highway driving... and for me, the DOD hurt...

as I mentioned, I gained 2mpg after I disabled it...
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Old Jul 20, 2010 | 08:12 PM
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Originally Posted by Bryan921SS
Does using 87 hurt the mileage??
lower octane burns faster... as such, it doesn't get a chance to burn all of the fuel, it's more of a flash ignition... so you don't get the most efficient use/performance of all the fuel, since it's not all being burned...

higher octane burns slower, so it's considered more efficient, since more of the fuel is actually being used/burned to provide performance...

so yes, you'd probably get better mileage with a higher octane fuel...
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Old Jul 20, 2010 | 08:17 PM
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how does dod hurt you in the city?
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Old Jul 20, 2010 | 08:24 PM
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Originally Posted by indynotch50
Just as it says... I'm trying to gauge how much I actually use this. I drive 54 miles of interstate, 30 miles of highway and the rest city/ country road.
However I still only average 20 mpg. The open road has some elevation changes and whatnot...
Basically if I rarely use it, I'm getting rid of it.
How do you tell? Like this (see LED in pic)

I was amazed at how much it is actually on, and how often it goes on and off without being able to feel it. On cruise it is pretty invisible.

And I notice between 2-4 mpg higher with DoD on, on the highway.
Attached Thumbnails How to tell if DoD is working?-dsc01038.jpg  
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Old Jul 21, 2010 | 06:37 AM
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On the way in to work I tried to pay more attention and keep speeds a little lower (I typically run interstate at 80) and I did notice it on a lot more just by looking at the instant display.
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Old Jul 21, 2010 | 06:38 AM
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Originally Posted by jderou_GXP
How do you tell? Like this (see LED in pic)

I was amazed at how much it is actually on, and how often it goes on and off without being able to feel it. On cruise it is pretty invisible.

And I notice between 2-4 mpg higher with DoD on, on the highway.
Any chance you could send a quick how to on the LED?
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Old Jul 21, 2010 | 07:38 AM
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I took a trip from New Jersey to Maryland...Deeeeep in Maryland and it was about 90% highway. I hardly gunned it and kept it on cruise control at about 65-70 mph range. When i stopped at a local Sunoco on the way back, i put 25 bucks premium in it which filled it up and i got 330 miles on the tank. All in all, for a daily driver, this car is very good if you have the DoD on and if you do alot of highway driving.
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