[Tex2SS]

Hey guys just got a quick question for you. I'm curious if I change driving modes, does it affect my gas mileage, or more correctly my gas yardage. Assuming of course that I drive the same in the different modes and that I have everything set to auto mode select. Although, I'm assuming that the different modes for the engine sound management, the steering and suspension should not change my gas yardage at all, but I'm not sure about the different transmission modes.

[cellsafemode]

for the SS, the driving mode may impact how aggressive the car gets with the transmission, which can impact mileage. However, except for track mode, the other modes should be able to be driven the same way and you'll get the same mileage.

With the V6 and V4, the driving mode only really impacts the steering stiffness... so if you drove the same way you should get the same mileage. Performance shift mode only activates when you're doing things that would lend itself to needing it. So you wouldn't be caring about mileage at that point anyway.

[ctrlz]

Originally Posted by cellsafemode

for the SS, the driving mode may impact how aggressive the car gets with the transmission, which can impact mileage.

As cellsafe points out, this can impact fuel economy. But it really only has an impact when you are accelerating, by delaying upshifts. So, if you are doing a lot of stop-and-go driving, you can probably see small fuel economy differences between modes.
Since you say, "assuming I drive the same," I think the difference would be negligible.
The transmission has normal, sport, and track modes.
The throttle has weather, normal, and track.
The combination of aggressive driving and track modes for the throttle and tranny would take a toll on your mpg for sure.

[Gunkk]

+1 ctrlz

For a given throttle input:

• Track mode = higher shift points = probably the worst mileage.
• Sport mode = non-linear throttle = worse mileage than tour for the same pedal motion.
• Tour = both throttle & trans are better for mileage.
• Snow/ice = best (limited torque/throttle).

However if you change your throttle inputs to compensate for butt-dyno from the above ... then all bets are off!

[Tex2SS]

Interesting. I didn't realize that there was a throttle difference between the different modes. I thought it was just an automatic transmission shifting thing.

[Yanniz]

Originally Posted by cellsafemode

for the SS, the driving mode may impact how aggressive the car gets with the transmission, which can impact mileage. However, except for track mode, the other modes should be able to be driven the same way and you'll get the same mileage.

With the V6 and V4, the driving mode only really impacts the steering stiffness... so if you drove the same way you should get the same mileage. Performance shift mode only activates when you're doing things that would lend itself to needing it. So you wouldn't be caring about mileage at that point anyway.

Don’t think that’s correct. My V6 shifts higher and holds hearts longer in Sport vs Touring mode.

Difference in mileage is very minimal though

[cellsafemode]

sport and touring as far as the trans goes for the V6, i'm almost 100% positive that the trans is not impacted and it's all in your head or subconscious driving behavior changes.

Then again, I've been running non-stock ecu and tcm tune for the past 2+ years so maybe someone (the 1 or 2 people) who have hptuners for the lgx can let us know what tables look like. I highly doubt it is different. Only performance shift mode behaves any different with shift points.

[GingaNinja]

Originally Posted by Gunkk

+1 ctrlz

For a given throttle input:

• Track mode = higher shift points = probably the worst mileage.
• Sport mode = non-linear throttle = worse mileage than tour for the same pedal motion.
• Tour = both throttle & trans are better for mileage.
• Snow/ice = best (limited torque/throttle).

However if you change your throttle inputs to compensate for butt-dyno from the above ... then all bets are off!

The throttle stuff is incorrect.


There are 3 different throttle maps. Tour & Sport Modes share a throttle map.

1) Snow/Ice Mode
2) Tour & Sport Modes
3) Track Mode


Re the OP's question; In my opinion, how much stop-and-go there is, and what you do with your right foot will make the biggest difference in millage

[Yanniz]

Originally Posted by cellsafemode

sport and touring as far as the trans goes for the V6, i'm almost 100% positive that the trans is not impacted and it's all in your head or subconscious driving behavior changes.

Then again, I've been running non-stock ecu and tcm tune for the past 2+ years so maybe someone (the 1 or 2 people) who have hptuners for the lgx can let us know what tables look like. I highly doubt it is different. Only performance shift mode behaves any different with shift points.

Interesting. What would be impacted then if not the transmission?

The steering can be set to either mode all the time (for example set steering to “sport” always independent of what “drive” mode you select w/the selector Switch) through the Main Menu.

Who knows? I do notice though in Tour shifts happen quickly, vs in Sport gears are held longer/shifts @ higher rpms.

[cellsafemode]

I'd argue that the only thing documented is that steering stiffness, which yes can be changed independently.

Everything else is guessing, and most everyone who does says the differences are almost impossible to feel. Convenient. Only people who will know for sure are those who are looking at the hptuners tables or if the guys at trifecta want to chime in.

[ctrlz]

I don't think anyone is going to be happy for too long driving an SS using the Snow/Ice throttle map. While I like it for snow and ice, there is no point owning an SS and using this on a regular basis to save a few pennies. It's basically "granny mode."

[GingaNinja]

Originally Posted by cellsafemode

I'd argue that the only thing documented is that steering stiffness, which yes can be changed independently.

Everything else is guessing, and most everyone who does says the differences are almost impossible to feel. Convenient. Only people who will know for sure are those who are looking at the hptuners tables or if the guys at trifecta want to chime in.

None of this is guess-work. This is all explained in your owners manual. For my 2017, on page 239, there's a chart basically showing it all. The power never changes, regardless of what mode you have it in (this includes Teen Mode and Valet Mode).

[Number 3]

Is it too late for the smart a@@ crack about getting 35,000 yards per gallon?

[Yanniz]

Originally Posted by cellsafemode

I'd argue that the only thing documented is that steering stiffness, which yes can be changed independently.

Everything else is guessing, and most everyone who does says the differences are almost impossible to feel. Convenient. Only people who will know for sure are those who are looking at the hptuners tables or if the guys at trifecta want to chime in.

You are absolutely wrong, shift points are higher/Gears are held longer. Been in muscle cars forever and drag raced for a few years, I can definitely tell you it is not “impossible to feel!” 👍