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35IS MPG Figures?

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
Z4monster
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35IS MPG Figures?

Post by Z4monster » Sun Jan 08, 2017 9:17 pm

Since getting mine it's averaged around the 25mpg mark. I would be very upset if I was only getting 15mpg from it unless I was absolutely caning it everywhere!
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35IS MPG Figures?

Post by alex » Mon Jan 09, 2017 10:48 am

Maniac wrote:As others have stated this is entirely dependent on drIving style, length of journey, traffic, average speeds, temperature and more.

I get 18mpg driving to and from work, short journey, cold engine, stop start traffic . On the motorway I average 35 and have managed over 40 being careful.
I'm very similar, my commute to work is about 10-15mins, mainly junctions/roundabouts and 1 short 40mph stretch - current average is 14mpg.

When I drove back up to Scotland on the motorway got well into 30+mpg - just depends on the journey.
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35IS MPG Figures?

Post by Busterboo » Mon Jan 09, 2017 11:14 am

willgill wrote:Driving like a saint i think I got nearly 430miles from a tank which equates to about 26-27mpg.
I must have a small tank, then, because my mpg is showing as 29.7 and a full tank as 300.

(Sadly, I haven't been able to get it below 29.7 in the month I've had my 35is. The Bridgestone run-flats, which will be changed on Wednesday, have done several 20-mile runs at n+30 and have been up to n+50 on billiard-table roads, but there's been no 'spirited driving' on winding A & B roads. There will be, I hope, but I doubt the mpg will go down to the OP's. That's 'stick your nose under the bonnet and sniff' wrong.)
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35IS MPG Figures?

Post by jimbo1958 » Mon Jan 09, 2017 11:45 am

I get around 17mpg on my 9 mile commute to work in my 35i.
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35IS MPG Figures?

Post by Maniac » Mon Jan 09, 2017 1:35 pm

On the same commute journey my Merc gets 25mpg (2.0 turbo petrol) and the same car I had as a loner but diesel returned 35mpg

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35IS MPG Figures?

Post by V8 Animal » Mon Jan 09, 2017 1:48 pm

Why V power?
I have 3.0 TT using standard petrol mixed driving 24mpg

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35IS MPG Figures?

Post by Sgreen » Tue Jan 10, 2017 12:39 am

My daily commute is town driving, clear run in a morning at 6.30am but stop start on the way home at night and average 25 mpg. On motorway runs can average 30 - 34mpg, so 15 does seem a tad low. Are you using your onboard computer to take your mpg or manually calculating it?
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35IS MPG Figures?

Post by Kingfisher » Wed Jan 11, 2017 11:46 am

15 mpg??? .... if I thought mine only did that much I'd chuck it in a skip! ... :cry:
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35IS MPG Figures?

Post by willgill » Wed Jan 11, 2017 12:27 pm

all depends how you drive it, sure if fuel economy is your primary goal you can achieve high 20s, but then why buy a 340hp car, swap it for the 1.8 and get the same body with better MPG, never really understood the denial that the 35is is fairly shocking at full chat, using the instant mpg read-out mine shows 8mpg. If I take the same reading on overrun it shows 28.8mpg, guess that's the map. 30+mpg seems like a pipe dream in mine at least :p
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35IS MPG Figures?

Post by chasBMW » Wed Jan 11, 2017 1:36 pm

willgill wrote:all depends how you drive it, sure if fuel economy is your primary goal you can achieve high 20s, but then why buy a 340hp car, swap it for the 1.8 and get the same body with better MPG, never really understood the denial that the 35is is fairly shocking at full chat, using the instant mpg read-out mine shows 8mpg. If I take the same reading on overrun it shows 28.8mpg, guess that's the map. 30+mpg seems like a pipe dream in mine at least :p
There have been many posts on this subject and this one of the most sensible I have read , have never quite understood the obsession with MPG figures
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35IS MPG Figures?

Post by Glyn » Wed Jan 11, 2017 2:46 pm

I get 27 mpg average, mix of fast country roads and a little city work.
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35IS MPG Figures?

Post by Smartbear » Wed Jan 11, 2017 4:29 pm

V8 Animal wrote:Why V power?
I have 3.0 TT using standard petrol mixed driving 24mpg
Hi, many people use V-power because of its cleaning capabilities, the detergents used clean the internals of your engine. Turbo engines especially can make more power using super unleaded also :thumbsup:
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35IS MPG Figures?

Post by sunnydays » Fri Jan 13, 2017 1:29 pm

willgill wrote:all depends how you drive it, sure if fuel economy is your primary goal you can achieve high 20s, but then why buy a 340hp car, swap it for the 1.8 and get the same body with better MPG, never really understood the denial that the 35is is fairly shocking at full chat, using the instant mpg read-out mine shows 8mpg. If I take the same reading on overrun it shows 28.8mpg, guess that's the map. 30+mpg seems like a pipe dream in mine at least :p
Thanks for the input mate, just to be clear in this scenario I am just utilizing the MPG figures to make sure nothing is leaking / wrong with the car performance wise. Everything appears to be okay, I went out of the way to drive it "gently" and managed 20 mpg +. Must just be my driving style that makes it go down to 15. Taking it on a motorway cruise tomorrow so will see what figures come back.

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35IS MPG Figures?

Post by willgill » Fri Jan 13, 2017 1:48 pm

sunnydays wrote:
willgill wrote:all depends how you drive it, sure if fuel economy is your primary goal you can achieve high 20s, but then why buy a 340hp car, swap it for the 1.8 and get the same body with better MPG, never really understood the denial that the 35is is fairly shocking at full chat, using the instant mpg read-out mine shows 8mpg. If I take the same reading on overrun it shows 28.8mpg, guess that's the map. 30+mpg seems like a pipe dream in mine at least :p
Thanks for the input mate, just to be clear in this scenario I am just utilizing the MPG figures to make sure nothing is leaking / wrong with the car performance wise. Everything appears to be okay, I went out of the way to drive it "gently" and managed 20 mpg +. Must just be my driving style that makes it go down to 15. Taking it on a motorway cruise tomorrow so will see what figures come back.
Sounds like you drive like me, if you cruise around 70 you should see 26/27mpg, if you sit behind a lorry at ~55 you might break 30, but where is the fun in that :driving:
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35IS MPG Figures?

Post by R.E92 » Fri Jan 13, 2017 3:16 pm

You have mechanical issues with the car if you are seeing less than 25 during a normal week of mixed driving.

My car is mapped and I have sticky wider tyres and I still see 27mpg as a combined weekly figure. That's a fairly equal mix of stop start motorway congestion, stop start city driving and when the roads allow 90mph cruising on the longer motorway runs and hard runs through twisty lanes.

Newer cars may have tighter engines and see lower figures initially. And if you are unlucky enough to live in an area with permanent congestions like central London where you barely get above walking pace then I can see a case for low 20s or high teens but anyone getting 15mpg has an issue unless they commute on the Nürburgring. Probably leaking injectors or unmetered air getting into the car at some stage causing the fuel ratio to be out of whack.

I see people saying that they get low mpg because they drive the car how it's supposed to be driven. But in all seriousness you have to be a complete lunatic to be using all 300bhp the car offers at all times. Even then you should be getting more than 15!!

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