M6 and 650i GC realistic fuel consumption
Discussion
I'm looking to upgrade from a 640D GC to a 650i GC and just wondering what the realistic fuel consumption is for a 80mph motorway cruise.
I get about 39mpg in my 640D.
I know the official combined is 32 mpg but what will I achieve cruising in real life, 28mpg??
I'm also considering an M6, but that scares me from an mpg perspective.
Any advice appreciated.
Thanks
Andrew
I get about 39mpg in my 640D.
I know the official combined is 32 mpg but what will I achieve cruising in real life, 28mpg??
I'm also considering an M6, but that scares me from an mpg perspective.
Any advice appreciated.
Thanks
Andrew
335d said:
Have you driven a 650i?
I was quite underwhelmed by a 640i. It was really smooth and quiet, but lacked any real urgency. The 640d felt the better car to me. That said, I haven't tried a 650i. It may be quite different.
You are looking at 320 bhp for the 640 and 450 for the 650. 3l 6 vs 4.4l v8. It'll be very different.I was quite underwhelmed by a 640i. It was really smooth and quiet, but lacked any real urgency. The 640d felt the better car to me. That said, I haven't tried a 650i. It may be quite different.
I'll chime in with my own useless information though and say my 545i does 30+ mpg on the motorway without issue and I think the official consumption stats are similar to the 650, maybe slightly favouring the newer 6.
This is my life time consumption of my M6 GC
That includes track days where consumption was not great!
A few 'drive it like a granny' trips because of average speed cameras and traffic
Motorway cruising (sorry about the quality of the picture)
And some rapid (continental
) cruising
Really, with a car like an M6 or 650i, fuel economy is just not an issue compared with the rate of depreciation!!
That includes track days where consumption was not great!
A few 'drive it like a granny' trips because of average speed cameras and traffic
Motorway cruising (sorry about the quality of the picture)
And some rapid (continental
) cruisingReally, with a car like an M6 or 650i, fuel economy is just not an issue compared with the rate of depreciation!!
Performance, as in moving a set distance in a (short) time interval, requires the car to do work, and that comes from energy in the fuel which is being burnt at an appropriate rate. Yes we all know that.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
RichardM5 said:
... (snip)
That includes track days where consumption was not great!
Radio 2, on a trackday?! Like it. That includes track days where consumption was not great!
@OP - I had a long-ish term loan of a 650i last year - over 3000 or so mainly motorway miles, was getting around 27mpg, but lots of that was at a cruise controlled 50mph M1 roadwork speed. I'd say a real-world 25 is possible (ymmv).
Prinny said:
RichardM5 said:
... (snip)
That includes track days where consumption was not great!
Radio 2, on a trackday?! Like it. That includes track days where consumption was not great!
https://youtu.be/RrdeHFMRtyI
turbobloke said:
Performance, as in moving a set distance in a (short) time interval, requires the car to do work, and that comes from energy in the fuel which is being burnt at an appropriate rate. Yes we all know that.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
In fact ICE engines aren't that efficient but that's not the point. There are lots of cars with similar performance but widely varying fuel consumption so the OP has a reasonable question.
Though a car the size and weight of a 6 series with high performance is never going to be a light drinker........
Shaoxter said:
HoHoHo said:
V5Ade said:
I have an F10 M5. My average is 17ish in town, 19-22 on the motorway.
I'd agree, that's pretty much exactly what I got in my F10 M5 
REALIST123 said:
turbobloke said:
Performance, as in moving a set distance in a (short) time interval, requires the car to do work, and that comes from energy in the fuel which is being burnt at an appropriate rate. Yes we all know that.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
If a certain level of performance is sought then the rate of fuel consumption / mpg is an inevitable casualty.
Modern engines are very efficient, and there are no magic gains to be had when fuel is being burnt at the stoichiometric mix. If leaner than stoich then mpg will improve but performance isn't going to be at peak and I would be keeping fingers crossed for the engine without some very clever management.
Not speaking for others here, but when choosing a performance car, mpg hasn't been a consideration as it's the performance, not fuel economy, sitting in a higher priority position on the list.
Also not speaking for others, when punting a performance car the solution to a rapidly emptying fuel tank is to refill the tank.
In fact ICE engines aren't that efficient but that's not the point. There are lots of cars with similar performance but widely varying fuel consumption so the OP has a reasonable question.
REALIST123 said:
Though a car the size and weight of a 6 series with high performance is never going to be a light drinker........
You did get my point after all Edited by turbobloke on Friday 6th January 09:28
RichardM5 said:
The radio was turned off! Here's a video, it would have been more fun if the guy in the 3 series touring had let me by though!
https://youtu.be/RrdeHFMRtyI
What a horrid little track for your car - it's like my local karting circuit!https://youtu.be/RrdeHFMRtyI
The Stiglet said:
RichardM5 said:
The radio was turned off! Here's a video, it would have been more fun if the guy in the 3 series touring had let me by though!
https://youtu.be/RrdeHFMRtyI
What a horrid little track for your car - it's like my local karting circuit!https://youtu.be/RrdeHFMRtyI
I enjoyed listening to the noise it made though.
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