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F80/F82/F83 M3 and M4 (2015 - Current)
F80 BMW M3 sedan, F82 BMW M4 coupe and F83 M4 convertible forum. This 5th generation M3 and all new M4 features a 3.0 liter twin turbo engine (engine code S55) 425hp and 406lbs of torque! Heavy use of light weight materials makes this generation lighter and faster then the outgoing E9x M3.

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  #1  
Old 08-12-2014, 05:55 AM
DerStig DerStig is online now
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Exclamation Gas Mileage Clarification

I just want to explain a few things regarding to the gas mileage to the prospective buyers or to the rest of the community.
  • "Efficient" mode for the throttle mapping, is indeed efficient. This was not the case in the old M3 where the "Normal" throttle mapping (which was the lowest setting), actually hurt the mileage of the car.
  • If driven like a grandma, car gets great mileage. Let me clarify:
    • You must, I repeat, you must keep it under 3000 RPM with light throttle application.
    • If you do not follow this rule, and tap the throttle just a little bit aggressively, the mileage gains are almost completely gone.
    • If driven hard, like the "proper" way. This car gets pretty much the same gas mileage as the old M3 (maybe a tad better).

I'll give you some numbers regarding the above:

New M3

Grandma Mode: In city 18-19 mpg, in highway 26-27 mpg.
Proper Mode: In city 10-12 mpg, in highway 17-19 mpg.


Old M3

Grandma Mode: In city 17-18 mpg, in highway 22-23 mpg.
Proper Mode: In city 10-12 mpg, in highway 15-17 mpg.

We go to the beach every weekend and the round trip is around 120 miles to and from our house. It's the same road, same road conditions, same everything. I have now done this trip hundreds of times with my old M3 and tens of times with the new M3. If the car is driven on grandma mode, D1, Efficient throttle, I get around 22 mpg on this trip. It's about 70% highway and 30% city. If I have fun, that number is around 18 or so. In my old car, I'd pretty much get maybe 1 mpg less.

The lesson is, it's all about horse power. The 430 horses magically does not come for free. The fact that turbos are pre-tensioned and spool up very quickly and aggressively in sport and sport+ modes also do hurt the gas mileage. In a daily driver for commuting, you cannot use anything but Efficient if you care about your mileage. The turbos are way too sensitive in sport and sport+ that the boundary of grandma to proper mode is very small and is easy to cross.

Last edited by DerStig; 08-12-2014 at 06:29 AM.
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  #2  
Old 08-12-2014, 06:09 AM
SuperTerp SuperTerp is offline
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It's far better then the m3 I remember hoping to see 350s miles till empty on the m3 usually 280s now I see 400+ regularly if I drive like a grandma enough
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  #3  
Old 08-12-2014, 06:28 AM
DerStig DerStig is online now
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Originally Posted by SuperTerp View Post
It's far better then the m3 I remember hoping to see 350s miles till empty on the m3 usually 280s now I see 400+ regularly if I drive like a grandma enough
Yes, if you look at my numbers, it is 15-20% better than the old M3 if driven properly. But what I have noticed is, I never drive it in grandma mode
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Old 08-12-2014, 06:38 AM
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tim330i tim330i is online now
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Great write up! Amazing with all the technology in the F8x M3 / M4 the gas mileage is only marginally better.

Tim
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Old 08-12-2014, 07:04 AM
DerStig DerStig is online now
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Originally Posted by tim330i View Post
Great write up! Amazing with all the technology in the F8x M3 / M4 the gas mileage is only marginally better.

Tim
Well to be fair, it is better. But it is better only if you drive the car as a 320i. Those numbers are absolutely unreachable if the car is properly driven as an M3. One might argue that 3-4 mpg of improvement is not good enough even in "grandma" mode, but that's something else.

I guess what they have done is to allow the car to have two entirely distinct behaviors/personalities.

Last edited by DerStig; 08-12-2014 at 07:08 AM.
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Old 08-12-2014, 09:57 AM
supershaft supershaft is offline
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So what is your typical range? In my 2008 M3 I'd be looking for a gas station around 250-260mi with highway driving. 230-240 if it's city. I am hoping that it will do at least 300 highway on a full tank otherwise I'll have to bite the bullet on a M5.
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Old 08-12-2014, 10:10 AM
DerStig DerStig is online now
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Originally Posted by supershaft View Post
So what is your typical range? In my 2008 M3 I'd be looking for a gas station around 250-260mi with highway driving. 230-240 if it's city. I am hoping that it will do at least 300 highway on a full tank otherwise I'll have to bite the bullet on a M5.
New one's gas tank is about 1-1.5 gallons smaller, so the range is pretty much the same, if not worse in daily driving 100% city. I usually get about 120 miles or less with half a tank of gas.
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Old 08-12-2014, 12:15 PM
Flstate Flstate is offline
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Nice write up


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  #9  
Old 08-12-2014, 05:51 PM
DerStig DerStig is online now
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Here is a picture I took just now. You can see that half a tank of gas and I got 120 miles out of it. Out of those 120 miles, 85 or so is pure highway miles, 35 is city driving.

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  #10  
Old 08-12-2014, 06:14 PM
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K-A K-A is offline
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The numbers are pretty solid considering the E92 I automatically see in "gas guzzler mode" with those figures, while the F80 gets to something a little more palatable. What's most significant is that of course you get a lot more power with those better figures.
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Old 08-13-2014, 05:42 PM
SuperTerp SuperTerp is offline
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Pretty damn impressive for a 15 gallon tank...
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  #12  
Old 08-16-2014, 04:41 AM
sdg1871 sdg1871 is offline
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0P has a good point that if you drive this car hard gas mileage is going to suffer. That's the case for any car. There's no magic formula to have huge horsepower numbers and high mpg in a combustion engine if you're using all the power.


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Old 08-16-2014, 06:59 AM
DerStig DerStig is online now
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Originally Posted by sdg1871 View Post
0P has a good point that if you drive this car hard gas mileage is going to suffer. That's the case for any car. There's no magic formula to have huge horsepower numbers and high mpg in a combustion engine if you're using all the power.


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Correct.

I was just trying to clarify to the people so that all this marketing around "more fuel efficiency" is really not very accurate. Many people think that you can drive this car the same way they drove the old one and expect 25-30% better fuel economy. That is very incorrect.

One more point I want to make is, in efficient mode, which is where those advertised 25-30% fuel numbers are possible, the exhaust sounds worse than a 335, almost like a 328. Only 2 flaps are open. Also, something else is off with the sound of the car. Either the active sound is completely off or the engine is not operating under full boost, for some reason it just sounds terribly weak.

Long story short, in the efficient mode, you are not really driving your M3. You are driving some other car. It's not just the throttle response that suffers, its the whole package. In the old car or the M5, the slowest mode never affected how the car sounded. I don't know why BMW did this to be honest. Maybe it means those flaps actually do contribute to the fuel economy?
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Old 08-17-2014, 11:12 AM
SuperTerp SuperTerp is offline
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Quote:
Originally Posted by supershaft View Post
So what is your typical range? In my 2008 M3 I'd be looking for a gas station around 250-260mi with highway driving. 230-240 if it's city. I am hoping that it will do at least 300 highway on a full tank otherwise I'll have to bite the bullet on a M5.
I raced about 6 times over the last two days and managed to get 270 and am 40 miles to empty... SO lots of woot pulls combined with normal non aggressive driving 250-270... If you just drive normal with maybe a couple punches over 300 easy.
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