LS4 Performance - 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.

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

Thanks so much. That would be great. Can the dealer flash that back to stock? The car didn't come with the tuner.

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.

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.

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.

My highway mileage didn't change when I turned off DOD. It's always been around 26-28mpg.

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.

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.

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...

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. :D

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?

You get better city mileage with DoD off, but highway mileage suffers.

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!

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

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.

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

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

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.