UK 650i or M6 GC realistic fuel consumption

Apr1962 · 01-04-2017, 05:33 PM

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

M6-Coupe · 01-04-2017, 06:28 PM

This is my personal experience:
F13 650i 400 HP (N63) 18 mpg Average
F13 650i 450 HP (N63 tu) 15 mpg Average
F13 M6 560 HP (S63 tu) 12 mpg Average
Never had 640 BTW

upstate650 · 01-05-2017, 10:29 PM

US numbers for my 650xi GC with N63tu, so not an imperial gallon. I average 19-20 and I'm not gentle. On relatively flat ground using cruise you will get 22-23 or so at 80mph. The 8 speed is geared pretty low. Runs at 1800 rpm at 80 mph. Stop and go traffic and hills and a heavy right foot can easily ruin these numbers.

If you can keep it under 70 you will see 27-28mpg, but what fun is that.

01-04-2017, 05:33 PM	#1
Apr1962 New Member 4 Rep 26 Posts Drives: 640D Join Date: Jan 2014 Location: UK Bristol iTrader: (0)	UK 650i or M6 GC realistic fuel consumption 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
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01-04-2017, 06:28 PM	#2
M6-Coupe Major General 1125 Rep 6,067 Posts Drives: F92 M8 Join Date: Feb 2014 Location: Bay area iTrader: (0)	This is my personal experience: F13 650i 400 HP (N63) 18 mpg Average F13 650i 450 HP (N63 tu) 15 mpg Average F13 M6 560 HP (S63 tu) 12 mpg Average Never had 640 BTW __________________ Current : 2020 F92 Black Sapphire M8 - ZF8 Gone : 2018 F80 Mineral Gray M3 - 6MT Gone : 2016 F82 Austin Yellow M4 - 6MT Gone : 2013 F13 Sakhir Orange M6 -7DCT Gone: 2013 F13 Alpine White 650i -ZF8
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01-05-2017, 10:29 PM	#3
upstate650 Lieutenant Colonel 305 Rep 1,719 Posts Drives: 2014 650xi Gran Coupe Msport Join Date: May 2013 Location: The Hinterlands of Upstate NY iTrader: (3) Garage List 2020 BMW M340xi [0.00]	US numbers for my 650xi GC with N63tu, so not an imperial gallon. I average 19-20 and I'm not gentle. On relatively flat ground using cruise you will get 22-23 or so at 80mph. The 8 speed is geared pretty low. Runs at 1800 rpm at 80 mph. Stop and go traffic and hills and a heavy right foot can easily ruin these numbers. If you can keep it under 70 you will see 27-28mpg, but what fun is that.
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