Wondering what kind of mileage i can expect to get if the Active Fuel Management is turned off?

 

This is an interesting topic! I've heard from at least one member (Devin) that his MPG improved when he had the Displacement On Demand de-activated. Not sure how many other members have done that who could compare. I know that this was a new(er) feature for GM to offer in the '06-'07 days and I am suspecting if more people saw a similar improvements turning that feature off, it's possibly a situation that GM still had some bugs to work out.

 

I have had times where it would stay in 8 cylinder for whatever reason, had a misfire at the time. It seemed to keep with the usual mileage.

 

My 06 SS is bone stock. With that being said, I will say I just drive it what I consider normally. By that I mean while I don't treat it like a race car, I also don't ***** foot around either. Ive noticed the mpg when in 8 cyl mode reading 18-22 mpg and when in 4 cyl mode its usually around 30 or so. unless going down hill then it shows 99mpg lol.
I don't see a big difference at least for myself.
And on a side note if there is a CEL or engine code the bcm shuts off the AFM/DoD system and operates in 8 cylinder mode only.

 

I typically average 22 MPG. When I got the misfire (which, BTW, only takes out the DoD if it's on a DoD cylinder), I got 13.

 

Reguardless of exactly how the Dod works any engine with a misfire the fuel mileage will be affected. I was just saying for at least with my car and driving habits, I see minimal difference in v8 mode vs 4cly mode as far as mileage goes. I wouldn't see a big advantage to disabling the system personally. The biggest gripe I would say with the Dod/AFM in my experience is it does cause the engine to burn oil. I may just be lucky or perhaps its my driving habits but my car doesn't burn a lot but it will burn some, maybe 1/2 a quart in 5000 miles.
Ive heard stories of others with way worse oil consumption, for that I would seriously consider disabling DoD.

 

Interesting topic. Mine's still un-tuned, mainly because mine's fortunately not one of the oil guzzlers so it hasn't been an urgent thing yet. I am thinking about installing a cutout so at that point I would need to tune anyway.

 

I don't think I just switched DoD off for Devin, I believe I made other tweaks in his tune at the same time, so his changes could be based off of that stuff too.

DoD needs to be turned off if you have an aftermarket exhaust, because it sounds AWFUL when it goes into 4-cyl mode.

Really though, with it tuned out, you shouldn't see a change in MPG that is noticeable enough.

All of the conversations about CEL turning the DoD off is correct, but you also have to know that when you have that same CEL, the car's computer is dumping fuel at the problem most likely, which would add to the high MPG consumption. The car doesn't know what's wrong, so it goes into a different mode.

 

You may be correct. I absolutely will be getting mine tuned, if for no other reason than to do something about the godawful throttle response. If a tune drops me to 13 mpg, you may be sure that a) I will have it tuned immediately back in, and b) you will hear about it.

 

I have a superchips flashpaq tuner. It doesn't turn off AFM,but It seems to have better throttle response and slightly better performance, at least i feel it does. The mileage has prettyuch stayedthe same. I see they have a newer updated tuner that has the option to turn off AFM.