MPG in 6th @ 2000rpm

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oo7ml

Active member
Hi, can someone do me a favour when they are driving on a motorway today... i am curious as to what MPG the M achieves when in 6th gear at 2000rpm on a motorway for a significant distance... some of you probably already know the answer... if not could someone reset the MPG clock when they are in 6th at 2000rpm and drive a few miles embracing and holding at that speed

Please don't reply telling me you don't get an M to worry about MPG :) I am just trying to see what the difference is between my old Z4 3.0 and an M, thanks in advance, much appreciated :wink:
 
Unfortunately that would mean running at about 50mph on a motorway, and you'll have truckers up your chuff :P

I can tell you that 20 miles at an indicated 70mph (on cruise control, but would be more like 67mph road speed) got me 31.2mpg last week. Don't normally go that slow for that long though.
 
Cool, thanks... i usually drive 150 miles at the weekend on a road that is restricted to 60mph due to HVG's... i was getting 40mpg on my 3.0i Z4
 
From memory I think it's around 33mpg. My commute is 35 miles each way 20 of which are motorway (no town driving) and the best I've managed is just over 33mpg on the clock. That's driving between 60 and 70 with no heavy acceleration.

Usual average for my commute is between 26 and 29mpg.
 
I just drove a 387 mile round trip on a single full (brimmed) tank driving at approx 70ish for the whole journey. When I filled up the car took 53.59l of fuel.

That's a calculated 32.85mpg. I honestly can't see how you can get it any higher without driving at 55 behind a lorry.

It may be slightly higher in a roadster as it has a lower Cd and less weight.
 
Daffy said:
It may be slightly higher in a roadster as it has a lower Cd...
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:thumbsdown:
  • Roadster has a cd of 0.38
  • Coupe has a cd of 0.35
Daffy said:
...and less weight.
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:thumbsup:
Roadster is about 16kg lighter though - but that's what you get when you add a solid roof and large rear hatch to the equation.
 
Are those figures for the ///M? I was sure I read a figure of .41 for the coupé when I bought it. I also thought that would make sense as the MC has a larger rump than either the MR or....R.

....*shrugs* ahh well.
 
Daffy said:
Are those figures for the ///M I was sure I read a figure of .41 for the coupé when I bought it. I also thought that would make sense as the MC has a larger rump than either the MR or....R.

....*shrugs* ahh well.
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They're the figures from the back of the ///M brochure/manual - although I'm sure both of those figures would come down to below .01 if you add a stubby and cupholders :thumbsup:
 
I don't think mpg is a major factor in your running costs, it's the servicing, warranty and insurance costs you need to worry about. FYI I cruise at approx 3.5k on motorways sitting around 80, approx 25 mpg but frankly I don't keep too close an eye on it as it's never going to be a tdi. Range is an issue on big trips!
 
tjlazer said:
I don't think mpg is a major factor in your running costs, it's the servicing, warranty and insurance costs you need to worry about. FYI I cruise at approx 3.5k on motorways sitting around 80, approx 25 mpg but frankly I don't keep too close an eye on it as it's never going to be a tdi. Range is an issue on big trips!
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I'm getting a 26mpg average since I last reset the 2nd MPG readout (about 8,000 miles). The 1st readout is reset at each fill, and that's currently sitting on 27.1mpg.

I brimmed it last week and despite it having 320 miles on the clock, claiming 20 miles to empty and showing 27mpg, I only managed to get 47 litres in which works out at 33mpg. So I'm wondering if the Z4M has a pessimistic MPG reading so that you don't run out? I know there was a procedure on the e34 M5's OBC that let you recalibrate the MPG reading by inputting a correction factor, wonder if there's something similar for the Z4M?

BTW my normal 'commute' is 2 miles of 30mph, followed by 10 miles of 70mph dual carriageway, followed by 200 miles of motorway & dual carriageway (M56, M6, M40, A404/M, M4) followed by 20 miles of twisty 50mph A roads, 4 days of 20 mile round trips to the B&B, and the reverse trip on Fridays. Cruise speed is an indicated 85mph (which is more like 80mph road speed). Overall I use 2 tanks a week for about 600 miles, and normally fill up as soon as the light comes on (within reason as I plan to not stop at motorway services).

If its flowing well, then good mpg comes easy. If it's stop-start then you struggle to top 20mpg.
 
oo7ml, I wouldn't base it on RMP but MPH as the M has a different Final Drive to the 3.0, so the speeds will be different at 2k RPM's.
 
If its flowing well, then good mpg comes easy. If it's stop-start then you struggle to top 20mpg.
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This too was my experience: up in Cumbria I was getting 27mpg average on my commute, but in the commuting hell that is known as the Bristol ring road (4174) I was reduced to 17.7mpg :cry:

That 10mpg difference coupled with a slightly longer commute (27 miles round trip as opposed to 20) made all the difference. My fuel bill was £1300 per year more expensive totalling to £2600 for 12 months just to get to work! :headbang:

Scary Stuff :o
 
I got 28mpg on 750km trip, mostly on motorways but also traffic, villages and the odd sprint (every péage actually). stayd mostly at 160km/hr
 
Daffy said:
When I filled up the car took 53.59l of fuel.
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What was your Range on that tank? much over 300?

My long term average is on about 19mpg but the battery was out not that long ago :driving:
 
oo7ml, did it today for four miles, got just over 40mpg, slightly downhill, but driving normally. mmm-five is right, speed is about 53 on the speedo, bit less in reality.
 
As much as I'd absolutely love to own a Z4MC, it's threads like this which remind me that I'm unlikely to actually do so! :(
 
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