[NISFAN]

Originally Posted by Boosted321

Your maths I would say

Can't see how you'd get 21 out of the 335d on the road if your wheels were actually moving.

And driven on the motorway as described above I would suggest you'd better 50 mpg.

We had two owners suggesting a steady run in a 335d returns 38 ish mpg. Maybe not the norm I don't know, but just comparing two 335d owners accounts with one 335i owners.

Maybe there are factors, the two 335d drives were described as 'hilly'. Perhaps the drag of the AWD system doesn't allow efficient 'coasting' on the downhills, who knows.

Pablo I believe lives near London, so stop start is no doubt a common driving style for him. He admits to having a heavy right foot. The two do not make a fuel saving combo.

Long term we could consult Fuelly for a more average figure, but initial results are not good for the xDrive system.

[NISFAN]

Originally Posted by Pablo68

Trust me...I would not want to drive like that all the time. But I am amazed how eco the N55 is if you want it to be. Probably because it has the torque curve of a diesel and combined with the 8 speed auto in Eco Pro mode at 70 on the flat its doing under 2k rpm and not screaming it's nuts off like a more traditional petrol turbo would be.

Trouble is you keep getting this over whelming urge to floor it to kickdown above 5k and listen to it sing. (where it's doing more like 20 mpg)

Would be interested to hear exactly what revs you are doing at 70-80 etc. Do you have the Laptimer App? That is really good to check what's going on on a cruise.

[Tengocity]

I will keep full details in a spreadsheet so can check and report on the figures over time.

[Steve C]

Fuelly suggests the following averages:

330d - 35mpg
335d - 31mpg
335i - 24mpg

[dopper99]

Originally Posted by NISFAN

..... but initial results are not good for the xDrive system.

I dont think xdrive can take all the "blame" for a higher fuel consumption, compared to say a 330d.

Take the E9X 330d vs E9X 335d. The 335d was always a lot thirstier and they were both sdrive.

[NISFAN]

Originally Posted by Tengocity

I will keep full details in a spreadsheet so can check and report on the figures over time.

Average speed would also help and % of motorway miles.

I am curious, as it looks like I will be going for a 4 series sometime next year.

The candidates are:

435d
435i PPK sDrive
430d PPK sDrive

If running cost was not important it would be 435i PPK, but my daily driver is an opted out company car doing 30k miles a year. The less it costs per mile on fuel, the more the car pays for itself. Ideally the options would be a 435d sDrive vs a 435i sDrive but for some mysterious reason there is no sDrive 35d version.

Or I keep my 330d and buy a second car = M4, CaymanS, etc Trouble is I already have two cars, so three makes no sense at all.

[NISFAN]

Originally Posted by Steve C

Fuelly suggests the following averages:

330d - 35mpg
335d - 31mpg
335i - 24mpg

All F3x's? Includes 330d xDrives?

Edit: Just looked myself, seems there are 2 xDrive 330d's which between them have averaged 37 ish mpg, whereas the 330d average excluding the two advertised xDrives is more like 43mpg.

No F3x 335d's on Fuelly.

[NISFAN]

Originally Posted by dopper99

I dont think xdrive can take all the "blame" for a higher fuel consumption, compared to say a 330d.

Take the E9X 330d vs E9X 335d. The 335d was always a lot thirstier and they were both sdrive.

Good point, perhaps need to look at 330d sDrive vs 330d xDrive to find the true cost of AWD.

Perhaps I will start an Andy Dufresne letter writing campaign to BMW requesting a 435d sDrive. How long do you think before they cave in and make me a one off?

[Boosted321]

Originally Posted by NISFAN

We had two owners suggesting a steady run in a 335d returns 38 ish mpg. Maybe not the norm I don't know, but just comparing two 335d owners accounts with one 335i owners.

Yes, fair point actually.

I was considering it compared to what my 335d (1700 miles old) does to the gallon.

[dopper99]

Originally Posted by NISFAN

Good point, perhaps need to look at 330d sDrive vs 330d xDrive to find the true cost of AWD.

Perhaps I will start an Andy Dufresne letter writing campaign to BMW requesting a 435d sDrive. How long do you think before they cave in and make me a one off?

You should try a 335d xdrive. You might actually like it.

[Bens3T]

Maybe he would like it too much...

[NISFAN]

Originally Posted by dopper99

You should try a 335d xdrive. You might actually like it.

Yes I should try one

[NISFAN]

Originally Posted by Boosted321

Yes, fair point actually.

I was considering it compared to what my 335d (1700 miles old) does to the gallon.

Have you kept records of fill ups? Consider being the first 335d on Fuelly

[Steve C]

If we assume the official BMW figures for fuel consumption are at least intra-consistent (if wildly optimistic) and flexing down for realism, the following may be concluded:

x-drive costs 1.9mpg
moving from 330d to 335d costs 1.2mpg (assuming same driven wheels)
moving from 335 diesel to 335 petrol costs 9.8mpg (assuming same driven wheels)

[dopper99]

But to be fair to the petrol engine, it won't cost you in the pocket as much as those figures suggest as petrol is cheaper.

[NISFAN]

Originally Posted by Steve C

If we assume the official BMW figures for fuel consumption are at least intra-consistent (if wildly optimistic) and flexing down for realism, the following may be concluded:

x-drive costs 1.9mpg
moving from 330d to 335d costs 1.2mpg (assuming same driven wheels)
moving from 335 diesel to 335 petrol costs 9.8mpg (assuming same driven wheels)

Oooh that would be a dangerous assumption

[dopper99]

Anyway, without sounding like a broken record, and this has been discussed many times before........ It all depends on how the individual drives (cue HighlandPete here!).
I'm sure someone could get more mpg from a 335i over a 330d/335d on the same stretch of road if driven with the intension of saving fuel.

[Steve C]

Originally Posted by dopper99

But to be fair to the petrol engine, it won't cost you in the pocket as much as those figures suggest as petrol is cheaper.

Good point. Adjusting for cheaper petrol prices reduces the 335i deficit to 8.5mpg.

[Steve C]

Originally Posted by dopper99

Anyway, without sounding like a broken record, and this has been discussed many times before........ It all depends on how the individual drives (cue HighlandPete here!).
I'm sure someone could get more mpg from a 335i over a 330d/335d on the same stretch of road if driven with the intension of saving fuel.

Agreed but the point here is the difference between the engines assuming the same driver / road.

[Tengocity]

Originally Posted by NISFAN

Average speed would also help and % of motorway miles.

I am curious, as it looks like I will be going for a 4 series sometime next year.

The candidates are:

435d
435i PPK sDrive
430d PPK sDrive

If running cost was not important it would be 435i PPK, but my daily driver is an opted out company car doing 30k miles a year. The less it costs per mile on fuel, the more the car pays for itself. Ideally the options would be a 435d sDrive vs a 435i sDrive but for some mysterious reason there is no sDrive 35d version.

Or I keep my 330d and buy a second car = M4, CaymanS, etc Trouble is I already have two cars, so three makes no sense at all.

Will be tough to give you much more detail as the other half will use it more than me during week, so it's going to be a mish mash of her driving and mine. Her commute is Herts to Reading, which although is motorway, as anyone down this way will know, that actually means stop start much of the way!

[Tengocity]

Originally Posted by Tengocity

First long drive in our F31 335d today - Perth to Herts. Adaptive cruise much of the way, some time in ECO PRO, mostly in Comfort mode. Steady low 70's till across the border then 80-85 through most of England, until the M1 was reached and then we were stuck doing 60-70 in the jammed up outside lane.

Car had 1 passenger and a set of wheels, and a large bag, running on 18" Pirelli Winter RFTs. The car started the journey with just 206 miles on it.

Averaged 39.3mpg at an overall average speed of 74.8 mph, one stop for lunch.

Our 330d would do that at around 42mpg, so a little worse I guess.

I used ECO PRO to start with and whilst we were doing 70 in Scotland and the average was 40 at that point. Upping the speed and going to Comfort only dropped the average by 1mpg! Not worth the bother!

The only thing I wondered was whether the sodden road conditions in Scotland had a significant impact? increased drag perhaps?

Adpative cruise is interesting, very good in some ways, but you have to develop a technique to get the best out of it. I agree that it isn't the best thing for fuel economy as it only looks one car ahead and has to use the brakes, when a good driver would have been coasting already.

I've just started my spreadsheet and the actual fuel consumption (brim to brim) turns out to have been 36.8mpg... so even worse than thought!

Also, when I filled up I had 0 range showing yet only managed to put in 54.8 litres... quite a bit less than the supposed capacity.

[NISFAN]

Originally Posted by dopper99

Anyway, without sounding like a broken record, and this has been discussed many times before........ It all depends on how the individual drives (cue HighlandPete here!).
I'm sure someone could get more mpg from a 335i over a 330d/335d on the same stretch of road if driven with the intension of saving fuel.

While this is true, there are boundaries limited to the particular car/gearbox/drivetrain package. Operating envelope if you like. For example I have achieved an average of over 62mpg on a single motorway run. This can't be beaten by a 335i under any conditions (with same average speed). But yes I could drive and return worse figures than a cleanly driven 335i.