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      10-26-2020, 01:33 PM   #1
j2dad5389
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Sport vs comfort mode fuel economy

Was cruising down the highway yesterday and thought to myself if there is a difference in fuel economy cruising in sport mode vs comfort mode. Obviously driving around the city in the sport with constant stop and go will hurt it, but what about cruising down the high way at 65 in 8th gear? Will estimated MPG be the same in both comfort and sport? Or a little better for comfort? I'd imagine definitely so for Eco mode as the rpm's will dip to below 1k, but in sport in comfort; both the same RPMS.
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      10-26-2020, 01:45 PM   #2
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j2dad5389 I've noticed on the highway Sport is 1000+rpm more than comfort... The best gas mileage I've gotten was 34mpg in Eco mode driving East coast highways (Hilly not flat)... Eco mode let's the transmission go into coast mode when letting up on the accelerator...
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      10-26-2020, 01:46 PM   #3
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Put it on cruise control on a flat stretch of highway, look at the MPG readout on your dash and toggle from Sport to Comfort and you'll know. At cruising speed the tranny is usually one gear lower in Sport than Comfort, which can make a big difference. There will be less of a difference, if any, in town. The difference between Eco and Comfort is slight, not worth even using Eco IME.
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      10-26-2020, 01:57 PM   #4
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More or less it helps with the car holding onto boost, and throttle sensitivity. if you are 8AT it will work together with your transmission to shift earlier to encourage low rpm as well as make the throttle not be responsive aka 50% less sensitivity unless you go WOT. With the 6MT it does nothing other than change the sensitivity of the gas pedal and "eco mode" to bring air outside inside the cabin to work with heat/ac instead of running in recirculation to use more power and in theory worse gas milage.
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      10-26-2020, 02:26 PM   #5
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I get better gas mileage in Sport when I'm driving backroads in upstate NY, where the roads are 45-55 MPH and very hilly/twisty. I feel Comfort mode is far too eager to get into a high gear, causing lots of downshifts. Even when running Sport in D mode, I feel the extra turbo boost helps me navigate the roads more naturally and with more control. It has a direct impact on your mileage to be able to choose proper gearing (or for the transmission profile to be more appropriate for your roads), since in most cases the car can't really tell if a hill, or tight turn is coming.

As far as highway, hard to tell a difference between Sport and Comfort (or Comfort w/ SAT which stops at 7th gear)

So it really just depends where you live. Something tells me Comfort/Eco would be better if I lived in a flatter place with 30 MPH roads everywhere.
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      10-26-2020, 04:02 PM   #6
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Quote:
Originally Posted by j2dad5389 View Post
Was cruising down the highway yesterday and thought to myself if there is a difference in fuel economy cruising in sport mode vs comfort mode. Obviously driving around the city in the sport with constant stop and go will hurt it, but what about cruising down the high way at 65 in 8th gear? Will estimated MPG be the same in both comfort and sport? Or a little better for comfort? I'd imagine definitely so for Eco mode as the rpm's will dip to below 1k, but in sport in comfort; both the same RPMS.
It is more about which gear you are in, than the mode itself, when you are cruising. 8th should return better mpg than 7th, due to less engine losses running the lower rpm.

One of our UK motor magazines ran some tests a few years back, across several engine/drivetrain combinations. All returned better mpg in the highest gears when cruising, even from relatively low road speeds.
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      10-26-2020, 04:16 PM   #7
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You can try shifting ma tally in sport to see if you can get better fuel economy.
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      10-26-2020, 04:25 PM   #8
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Highway Gas Mileage...
Sport < Comfort <Eco

Sport keeps the trans in 7th. Comfort/Eco let the trans use 8th. So gearing provides the obvious improvement when steady highway cruising.

Eco will enable coasting vs Comfort, and I beleive it curtails/disables some power-usage items too (climate controls, etc.). Eco seems for 'hyper milers' mostly (and for EPA), but the coasting can increase mileage if your route is hilly.
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      10-26-2020, 08:29 PM   #9
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I am getting 220 miles per tank with a heavy foot always in sport+!
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      10-26-2020, 08:43 PM   #10
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I was told by the salesperson that the difference was 1-2mpg with Sport being lower. Not sure if that's accurate 🤷🏻*♂️
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      10-27-2020, 10:56 AM   #11
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With the manual I've found sport mode to return lower mileage. I think part of this is I drive more aggressively, since the car is behaving like a performance oriented BMW should, but also because the throttle is far more sensitive.

On a long highway haul, the lag in the throttle on ECO or comfort tends to even out or cancel the slight variations in my foot position whereas sport will respond almost immediately which doesn't lead to a steady fuel efficient cruise.
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      10-27-2020, 11:29 AM   #12
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Sorry all, should've clarified. I did this in manual mode "M8". I know if I was in standard sport mode would keep me in 7th gear.

So I should rephrase my question. Highway, 65mph, both sport mode and comfort mode manually in 8th gear. Will these return the same fuel economies?

Thanks, everyone for your input Was just curious.
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      10-27-2020, 12:33 PM   #13
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8th gear is 8th gear, 1800 RPM is 1800RPM, no matter what driving mode you have it in. For fuel economy to go down revolutions per mile must go up.
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      10-27-2020, 03:32 PM   #14
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I tried ECO one evening and couldn't stand it so I went straight back to Sport+.

However, I just migrated to this car from a 2016 Mustang GT so my comparative gas mileage impression is much improved right now.
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      10-27-2020, 04:31 PM   #15
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Quote:
Originally Posted by j2dad5389 View Post
Sorry all, should've clarified. I did this in manual mode "M8". I know if I was in standard sport mode would keep me in 7th gear.

So I should rephrase my question. Highway, 65mph, both sport mode and comfort mode manually in 8th gear. Will these return the same fuel economies?

Thanks, everyone for your input Was just curious.
Isn’t this something you could determine yourself in just a few minutes on the highway? Put it in sport mode,check the mileage. Put it in comfort mode and check again.
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      10-27-2020, 04:33 PM   #16
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Quote:
Originally Posted by erickonphoenix View Post
I tried ECO one evening and couldn't stand it so I went straight back to Sport+.

However, I just migrated to this car from a 2016 Mustang GT so my comparative gas mileage impression is much improved right now.
There are 2 modes in between.
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      11-02-2020, 07:41 AM   #17
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I've actually been kind of testing this. For the past month I've only driven in sport mode after a year of dailying comfort mode. I drive pretty heavy footed and get roughly 270 miles per tank. The lowest I've seen so far dailying sport mode is like 265 which is wildly surprising to me lol.
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      11-02-2020, 08:21 PM   #18
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Quote:
Originally Posted by j2dad5389 View Post
Sorry all, should've clarified. I did this in manual mode "M8". I know if I was in standard sport mode would keep me in 7th gear.

So I should rephrase my question. Highway, 65mph, both sport mode and comfort mode manually in 8th gear. Will these return the same fuel economies?

Thanks, everyone for your input Was just curious.
If you have good petal control, then there should be no difference. I find on hilly roads, I get better in sport since I don't need to get so far into the gas to maintain speed on hills.

But, if you are "fluttering" the petal a lot in sport, fuel economy will suffer. That's why the eco and normal "feel dead" at light throttle. Engineered to remove the idiot behind the wheel out of the equation to maintain fuel economy.
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      11-02-2020, 09:11 PM   #19
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First things first, Sport+ is the only mode where the gearbox wont shift into 8th while crusing at 70mph say, Sport will shift into 8th.....

Sport+ will not allow you to put cruse on, where Sport will.

But as others have said 8th gear at 1800rpm is exactly the same be it in sport+, sport, comfort and eco. These cars dont have any fancy shut down cylinder modes.

If using cruse you wont see any gain between sport/comfort/eco unless you come across steep inclines where the car would then shift down in sport before it would in comfort.... even then i bet the diffrene between the higher RPM vs Labouring the engine would be minimal.

Only time you might gain is where you have coasting set up on ECO mode and your driving down hill, ECO will then coast, where as sport will hold it in gear.... But lets be honest long down hill sections arnt true reflections on real world MPG.
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      11-02-2020, 09:30 PM   #20
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Even coasting downhill in ECO won't do squat for your mileage. The next time you go down a hill look at your mileage monitor. No matter what the mode it's going to swing all the way to the left.
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      11-03-2020, 04:33 PM   #21
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Quote:
Originally Posted by jackstrath View Post
First things first, Sport+ is the only mode where the gearbox wont shift into 8th while crusing at 70mph say, Sport will shift into 8th.....
ONLY if you have configured "Sport" to apply only the chassis setting and not also the drivetrain setting. If you set "Sport" to apply both chassis and drivetrain, or just drivetrain, 7th is top gear for Sport and Sport+.
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      11-03-2020, 08:02 PM   #22
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Quote:
Originally Posted by visionaut View Post
ONLY if you have configured "Sport" to apply only the chassis setting and not also the drivetrain setting. If you set "Sport" to apply both chassis and drivetrain, or just drivetrain, 7th is top gear for Sport and Sport+.
Hmm thats not how my car works

I now have "sport" for chassis only as i cant stand the throttle response in sport/sport+

But when i had it set for both chassis and drivetrain Sport will go into 8th but Sport+ wont, 100% as i used to drive around in sport+ all the time and use cruse control and the 2 things the car did when double pushing the cruse conrtol was move into sport and shift up a gear.
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