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      03-27-2013, 12:37 PM   #1
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Question Fuel Efficiency

I'm sorry in advance if this sounds like a silly question... but what setting do you guys leave your M3 in to acheive the best mpg? Drivelogic setting, dampers, brand of fuel, etc...

With gas going over $4.53/gal here in Hawaii, it's begining to hurt.

I know I might get some cracks here about owning an M3 and complaining about gas prices. My friends do the same thing. Fair enough.


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      03-27-2013, 12:51 PM   #2
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Mileage goes up when the m3 can breathe and cruise long distance. Obviously you are more in a stop and go situation. It is what it is. I hit 12 to 16 around town. Mixed traffic and freeway. When I do longer road trips in 6th I get 22.
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      03-27-2013, 12:53 PM   #3
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Quote:
Originally Posted by Peahi View Post
Mileage goes up when the m3 can breathe and cruise long distance. Obviously you are more in a stop and go situation. It is what it is. I hit 12 to 16 around town. Mixed traffic and freeway. When I do longer road trips in 6th I get 22.

True, I do a lot of highway driving.

I even tried to put more air in the tires... 40psi. Nada.
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      03-27-2013, 12:53 PM   #4
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Quote:
Originally Posted by Peahi View Post
Mileage goes up when the m3 can breathe and cruise long distance. Obviously you are more in a stop and go situation. It is what it is. I hit 12 to 16 around town. Mixed traffic and freeway. When I do longer road trips in 6th I get 22.
Same here. Averaged 24 mpg on my way to L.A. once (according to display )

On a full tank I get ~220 miles before the fuel gauge displays 30 miles left on tank.
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      03-27-2013, 01:11 PM   #5
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Quote:
Originally Posted by MY13E92M3 View Post
I'm sorry in advance if this sounds like a silly question... but what setting do you guys leave your M3 in to acheive the best mpg? Drivelogic setting, dampers, brand of fuel, etc...

With gas going over $4.53/gal here in Hawaii, it's begining to hurt.

I know I might get some cracks here about owning an M3 and complaining about gas prices. My friends do the same thing. Fair enough.


Cheers,
Chris
You'll get cracks here related to any subject. Everyone's used to it It's good to track fuel efficiency occasionally, it may help determine an issue related to the engine and its performance, like worn spark plugs, coils, O2 sensors, etc.
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      03-27-2013, 01:37 PM   #6
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Put in D, EDC to comfort, power to normal, don't turn M (which you might have it set to S1-5, power to sport or sport plus etc..) and drivelogic to 1.
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      03-27-2013, 01:40 PM   #7
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Originally Posted by BMWFB02 View Post
Put in D, EDC to comfort, power to normal, don't turn M (which you might have it set to S1-5, power to sport or sport plus etc..) and drivelogic to 1.
Thanks BMWFB02! I was mainly curious about the drivelogic setting.


Cheers!
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      03-27-2013, 01:41 PM   #8
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City: 15-16 (w/Ethanol); 16.5-17.5 (w/o Ethanol)
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      03-27-2013, 02:06 PM   #9
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I'm at 17.4 MPG average.

DriveLogic set to 1. Power: Off. EDC: Comfort

In the city I'm average roughly 15 MPG. On the highway, around 23 MPG.
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      03-27-2013, 02:15 PM   #10
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Unfortunately, the best way to save on gas is to always drive it below 2K RPM, and turn it into neutral as often as possible. But I'd rather drive a freaking Prius then =)
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      03-27-2013, 02:24 PM   #11
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BS to all those claiming over 20mpg. The sticker on the car only claims 20mpg highway (which is probably even optimistic). So you are all doing better than the factory rating? Yea right. I assume people are reporting this because they are cruising on the highway, then resetting their mpg indicator, and being blown away when it says 20+. But in reality if you actually do the match each fillup its prob nowhere near 20mpg.
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      03-27-2013, 02:32 PM   #12
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What setting for good mileage? Off...
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      03-27-2013, 02:38 PM   #13
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Quote:
Originally Posted by gatorfast View Post
BS to all those claiming over 20mpg. The sticker on the car only claims 20mpg highway (which is probably even optimistic). So you are all doing better than the factory rating? Yea right. I assume people are reporting this because they are cruising on the highway, then resetting their mpg indicator, and being blown away when it says 20+. But in reality if you actually do the match each fillup its prob nowhere near 20mpg.

Granted that the US gallon is larger than Imperial gallon, but I've managed an indicated 330 miles to a tank, half of which was driving around on country and mountain roads (with a few full throttle overtakes), and the other half is motorway.

Most I've got is an indicated 360 miles from a long motorway journey.

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      03-27-2013, 02:46 PM   #14
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Quote:
Originally Posted by mlhj83 View Post
Granted that the US gallon is larger than Imperial gallon, but I've managed an indicated 330 miles to a tank, half of which was driving around on country and mountain roads, and the other half is motorway.

Most I've got is indicated 360 miles from a long motorway journey.

Attachment 837787
WOW. That's impressive!
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      03-27-2013, 02:46 PM   #15
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According to the manual, to improve gas mileage, particularly in traffic, you should be in D1. In that mode, the car, when at a standstill, will be in second gear. You will, of course, start off in second gear and you will get to the seventh gear very quickly. When you stop, you will always be in second. Selecting D1 will display one vertical bar on your dashboard.
I'm very satisfied with gas mileage in D1 .
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      03-27-2013, 02:49 PM   #16
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Quote:
Originally Posted by fuddman View Post
According to the manual, to improve gas mileage, particularly in traffic, you should be in D1. In that mode, the car, when at a standstill, will be in second gear. You will, of course, start off in second gear and you will get to the seventh gear very quickly. When you stop, you will always be in second. Selecting D1 will display one vertical bar on your dashboard.
I'm very satisfied with gas mileage in D1 .

You just reminded me of something...

How do I get the default drive mode to D1 vs. 1?

I have to knock it over twice to get to D1.
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      03-27-2013, 02:56 PM   #17
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Quote:
Originally Posted by gatorfast View Post
BS to all those claiming over 20mpg. The sticker on the car only claims 20mpg highway (which is probably even optimistic). So you are all doing better than the factory rating? Yea right. I assume people are reporting this because they are cruising on the highway, then resetting their mpg indicator, and being blown away when it says 20+. But in reality if you actually do the match each fillup its prob nowhere near 20mpg.
I routinely get 310+ miles per tank on road trips (326 miles once); practically all 4-lane and then put 15 gallons in the tank. You can get about 10% better mpg than manufacturer advertises by filling up with ethanol free gas. Of course, you will pay more per gallon in Florida, but the extra 50 miles range is nice.
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      03-27-2013, 03:03 PM   #18
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Quote:
Originally Posted by fuddman View Post
According to the manual, to improve gas mileage, particularly in traffic, you should be in D1. In that mode, the car, when at a standstill, will be in second gear. You will, of course, start off in second gear and you will get to the seventh gear very quickly. When you stop, you will always be in second. Selecting D1 will display one vertical bar on your dashboard.
I'm very satisfied with gas mileage in D1 .
Quote:
Originally Posted by MY13E92M3 View Post
You just reminded me of something...

How do I get the default drive mode to D1 vs. 1?

I have to knock it over twice to get to D1.
Like Fuddman said below, D1 means first gear in D mode. The vertical bars at the bottom indicate the Drivelogic setting - 1 to 6 bars, 6th bar only accessible in S mode with DSC off. Drivelogic setting adjusts the gear shift characteristics.

In D-mode, the higher the Drivelogic setting:
- the less eager the gear box is to select the highest gear (holds on to lower gears for longer)
- the higher the max rev threshold before upshifting at full throttle kickdown

In S-mode, the higher the Drivelogic setting:
- the more aggressive the shift to make use of fly wheel inertia for maximum acceleration if traction is sufficient
- the faster the shift

Starting in 2nd gear might not be a good idea, as there is less torque at the wheels to get going from a standstill compared to starting in first gear, thus more fuel is burnt to get the car going from a standstill. Starting in 2nd is primarily for slippery surfaces like snow, ice etc. The key to good fuel economy is smooth and light throttle inputs and getting to the highest possible gear as soon as possible, and lift-off throttle and minimise brake input by planning as far ahead of the road as possible e.g. not needing to brake or come to a stop when you can see that the traffic lights ahead are red by coasting, plot your course in lane changes without having to brake while maintaining a steady light throttle. Cruise control on motorway journeys are not the most economical either, as the computer cannot plan ahead and will accelerate and brake to maintain the set speed, especially if the motorway has lots of uphills and downhills.

Make no mistake, I didn't buy this car to save fuel - I do regularly burn up about 2 tanks on a track day, but it's nice to save when you don't need to enjoy the performance.

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      03-27-2013, 03:13 PM   #19
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Just below your shifter, there is a small switch which allows you to select D1, D2, D3, and so forth. When you depress this switch, the bars lite up on your dash display. You want to depress the switch so only one vertical bar shows bright on your dash. If you are at a standstill, and push that switch back and forth, you should see the dash board display change and also feel the transmission moving from first to second (as you go from D1 to any other mode).
Incidentally, when you see a dash display showing 1D, that does not mean you're in Drivelogic mode one. The "D" simply means your in Drivelogic and not Sequential. The number in front of the "D" or "S" is the gear the transmision is currently in. The mode is specified by the vertical bars.
Sometimes the car is going put you in a mode you seemingly didn't select. Such as when you first engage the transmission after starting it up. When that happens, just knock the shifter to the right and you'll be back to D1, provided, of course, you selected D1.
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      03-27-2013, 03:37 PM   #20
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Quote:
Originally Posted by ShutUpandDrive View Post
I'm at 17.4 MPG average.

DriveLogic set to 1. Power: Off. EDC: Comfort

In the city I'm average roughly 15 MPG. On the highway, around 23 MPG.
You can get the same numbers in S mode and shifting aggressively.
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      03-27-2013, 03:40 PM   #21
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Quote:
Originally Posted by mlhj83 View Post
Like Fuddman said below, D1 means first gear in D mode. The vertical bars at the bottom indicate the Drivelogic setting - 1 to 6 bars, 6th bar only accessible in S mode with DSC off. Drivelogic setting adjusts the gear shift characteristics.

In D-mode, the higher the Drivelogic setting:
- the less eager the gear box is to select the highest gear (holds on to lower gears for longer)
- the higher the max rev threshold before upshifting at full throttle kickdown

In S-mode, the higher the Drivelogic setting:
- the more aggressive the shift to make use of fly wheel inertia for maximum acceleration if traction is sufficient
- the faster the shift

Starting in 2nd gear might not be a good idea, as there is less torque at the wheels to get going from a standstill compared to starting in first gear, thus more fuel is burnt to get the car going from a standstill. Starting in 2nd is primarily for slippery surfaces like snow, ice etc. The key to good fuel economy is smooth and light throttle inputs and getting to the highest possible gear as soon as possible, and lift-off throttle and minimise brake input by planning as far ahead of the road as possible e.g. not needing to brake or come to a stop when you can see that the traffic lights ahead are red by coasting, plot your course in lane changes without having to brake while maintaining a steady light throttle. Cruise control on motorway journeys are not the most economical either, as the computer cannot plan ahead and will accelerate and brake to maintain the set speed, especially if the motorway has lots of uphills and downhills.

Make no mistake, I didn't buy this car to save fuel - I do regularly burn up about 2 tanks on a track day, but it's nice to save when you don't need to enjoy the performance.

Thanks.

Perhaps I mispoke.

When I start the car, I am in N. When I knock it over into drive I defualt to manual "1". If I want to get "D1" I have to knock twice. I would like to program the car to knock only once to get to "D1".

Is this possible?
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      03-27-2013, 03:44 PM   #22
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Quote:
Originally Posted by gatorfast View Post
BS to all those claiming over 20mpg. The sticker on the car only claims 20mpg highway (which is probably even optimistic). So you are all doing better than the factory rating? Yea right. I assume people are reporting this because they are cruising on the highway, then resetting their mpg indicator, and being blown away when it says 20+. But in reality if you actually do the match each fillup its prob nowhere near 20mpg.
In many cars, it's not that hard to exceed EPA ratings.

Not sure that applies to the M3, but for pure highway driving and cruising in 7th....20+ is surely obtainable.

For highway drives of about 30-40 miles, I find little difference in MPG between cruising at a steady 70-75ish compared to 80+ with sprints to redline to pass.
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