[harperium]

What are you guys seeing for real-world driving on the highway at, say, 70 mph and just cruising? I'm curious as to the max range of the X3 M on a road trip.

[DC X3M40i]

i too am curious.... i have to take a highway drive out east tomorrow
gonna fill up the tank and see how i do. from my little drives here and there on mixed basis, im not doing too well.. lol

[harperium]

Originally Posted by DC F97

i too am curious.... i have to take a highway drive out east tomorrow
gonna fill up the tank and see how i do. from my little drives here and there on mixed basis, im not doing too well.. lol

yeah, you'll have to exercise scientific discipline if you drive nice and easy, what mpg do you get?

[ando]

I did a 550 mile road trip one way and then back for Thanksgiving with winter tires on and 2,000 total miles got the fuel economy to 17.9 mpg with a range of 340 miles. Cruise was set to 75 mph.

[2kaccordocoupe]

10L/100km for me highway
125km/h for a consistent 3 hours or so.

[Waterbelly]

It get 23 mpg in efficient with cruise set on 72 mph.

[smithf80]

I think it would be hard for me to get over 20.

I'm averaging like 14mpg combined with about 50/50 split city/hwy now.

[BOGX4M]

Highway and town:

[Wills2]

Originally Posted by BOGX4M

Highway and town:

There is enough confusion with UK vs US gallons without you posting "Litres per 100km"....

[BrooklynG87]

For my first 1,000 miles I've been averaging 17.4 miles per gallon per my Fuelly app. This is a mix of city and highway driving.

[harperium]

Originally Posted by Waterbelly

It get 23 mpg in efficient with cruise set on 72 mph.

The X3 M40i on cruise around 70 mph gets about 30 mpg (at least for me).

The M and M40i are basically the same weight and aerodynamic shape (except the M doesn't have dynamic grill vents). So why is the X3 M less efficient?

[M5 TT]

Low compression engine won't help and the gearboxes desire to be in 7th rather than 8th can only hurt mpg

[Wills2]

Originally Posted by harperium

The X3 M40i on cruise around 70 mph gets about 30 mpg (at least for me).

The M and M40i are basically the same weight and aerodynamic shape (except the M doesn't have dynamic grill vents). So why is the X3 M less efficient?

23% less mpg but 43% more power seems a fair swap.

[Waterbelly]

Originally Posted by Wills2

23% less mpg but 43% more power seems a fair swap.

Unfortunately, that is not how physics works.

Moving the same mass at the same velocity in the same medium for the same amount of time uses the same amount of energy.

He is asking the right question, and I honestly don't have a great answer. The X3M uses a ton more gas to accomplish the same feat.

Sound? Heat? I dunno where the gas goes.

[Transfer]

Is RPM in 8th at 70ish mph different between M40i and the M? Is there active boost at that speed on flat ground? That's the only thing that I can think of that would account for the substantially different mpg.

[M5 TT]

Compression ratio has a huge effect on engine efficiency

40i 11.0:1
Vs
3M 9.3:1

3M is built for big boost. Tuning will be awesome on the engine

[zeusrazvy]

Originally Posted by Wills2

23% less mpg but 43% more power seems a fair swap.

Wills2, he is in US MPG, UK will be 25MPG. I find the fuel consumption for the M40i and X3M to be roughly the same.. I can get 25-26MPG at 70MPH on motorway without trying too much.
On the X3M UK Group, one guy posted an average of 20MPG for the M40i, which is similar to what I am getting.

[Wills2]

Originally Posted by zeusrazvy

Wills2, he is in US MPG, UK will be 25MPG. I find the fuel consumption for the M40i and X3M to be roughly the same.. I can get 25-26MPG at 70MPH on motorway without trying too much.
On the X3M UK Group, one guy posted an average of 20MPG for the M40i, which is similar to what I am getting.

I know....I was just pulling his leg.

I'm averaging 22.5mpg (UK)

[Wills2]

Originally Posted by Waterbelly

Unfortunately, that is not how physics works.

Moving the same mass at the same velocity in the same medium for the same amount of time uses the same amount of energy.

He is asking the right question, and I honestly don't have a great answer. The X3M uses a ton more gas to accomplish the same feat.

Sound? Heat? I dunno where the gas goes.

OK professor....

[zeusrazvy]

Originally Posted by Wills2

I know....I was just pulling his leg.

I'm averaging 22.5mpg (UK)

TBH i am coming from 640D which was averaging 30mpg... so 25 if i try hard or 21-22 if I don`t try? It`s just great, considering the weight power etc... I would say maaaaximum 10% difference between the x3m and x3m40i.
22.5 is a right number!

[JOHNBMWM5]

Originally Posted by M5 TT

Low compression engine won't help and the gearboxes desire to be in 7th rather than 8th can only hurt mpg

On my test drive I did notice this, car wanted 7th gear till 65/70MPH !!!, this to me was down to LOW torque, put me off the car a bit, however this was X4M which just got in my Garage I think the X3M is an inch or more narrower so going to try that one out early next year.Car does like the fuel though, I nursed it too 25 MPG, and then drove normal and got 20MPG just, this is low compared to my F90 M5 CP with gives 24/25 MPG normal with some booting.

[zeusrazvy]

Originally Posted by JOHNBMWM5

On my test drive I did notice this, car wanted 7th gear till 65/70MPH !!!, this to me was down to LOW torque, put me off the car a bit, however this was X4M which just got in my Garage I think the X3M is an inch or more narrower so going to try that one out early next year.Car does like the fuel though, I nursed it too 25 MPG, and then drove normal and got 20MPG just, this is low compared to my F90 M5 CP with gives 24/25 MPG normal with some booting.

Official numbers are identical between the two? X4M had the RIS?