New to the BMW family. Bad MPG BMW 420i f33

BmwAhm · 07-21-2021, 08:54 PM

Hi everyone, I just bought myself a 2015 BMW 420i Convertible M Sport (Auto) for the summer. Its been with me for two weeks of ownership however, I've just been getting no more than 16.4mpg around town driving, this has been in comfort and eco pro mode. Does this MPG sound about right for this car? I understand this car isn't the lightest Bmw out there, so what is everyone else getting? If it isn't right, what could it possibly be? Thanks in advance

chowser51 · 07-21-2021, 08:59 PM

That sounds low. My 430 got better. And it was running bm3 stage 1-93.

HFW003 · 07-22-2021, 12:25 AM

You’ll soon discover the number is dramatically impacted by the angle of that long pedal under your right foot!

frchdragon · 07-22-2021, 02:11 AM

Quote:

Originally Posted by BmwAhm

Hi everyone, I just bought myself a 2015 BMW 420i Convertible M Sport (Auto) for the summer. Its been with me for two weeks of ownership however, I've just been getting no more than 16.4mpg around town driving, this has been in comfort and eco pro mode. Does this MPG sound about right for this car? I understand this car isn't the lightest Bmw out there, so what is everyone else getting? If it isn't right, what could it possibly be? Thanks in advance

16mpg is very low, so either you are a very aggressive driver and you race from light to light or you need to have a good tune up (spark plug / air filter / oil change...)
You can also calculate it manually next time you fill up the tank.

E60F30 · 07-22-2021, 03:37 AM

That's really bad mpg. I get 23mpg out of my 328i with about 80/20 city/highway driving.

mmm-five · 07-22-2021, 06:21 AM

Something's not right there...I get more than that out of my Z4M around town.

Is this what is showing on the OBC, or from a tank-to-tank measurement, as the OBC can be wildly inaccurate.

Wires · 07-22-2021, 07:33 PM

How are you measuring that? Actual mileage vs gasoline pumped in, dash display, etc?

When we took delivery of our 2008, and it was "brutal" for mileage on the dash display until I reset both keys (IE 10MPG around town). It's like it the ECM logged a ton of fuel consumption with no mileage.

07-21-2021, 08:54 PM	#1
BmwAhm Registered 0 Rep 1 Posts Drives: Bmw 420i Convertible Join Date: Jul 2021 Location: United Kingdom iTrader: (0)	New to the BMW family. Bad MPG BMW 420i f33 Hi everyone, I just bought myself a 2015 BMW 420i Convertible M Sport (Auto) for the summer. Its been with me for two weeks of ownership however, I've just been getting no more than 16.4mpg around town driving, this has been in comfort and eco pro mode. Does this MPG sound about right for this car? I understand this car isn't the lightest Bmw out there, so what is everyone else getting? If it isn't right, what could it possibly be? Thanks in advance
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07-21-2021, 08:59 PM	#2
chowser51 Colonel 2025 Rep 2,808 Posts Drives: F33 430 and F39 M35i Join Date: Feb 2009 Location: Cleveland, OH iTrader: (3) Garage List 2018 BMW 430i xDrive [0.00]	That sounds low. My 430 got better. And it was running bm3 stage 1-93.
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07-22-2021, 12:25 AM	#3
HFW003 Brigadier General 5685 Rep 3,225 Posts Drives: 2024 M340i xdrive Join Date: Apr 2013 Location: Newcastle, Australia iTrader: (0)	You’ll soon discover the number is dramatically impacted by the angle of that long pedal under your right foot!
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07-22-2021, 03:37 AM	#5
E60F30 Enlisted Member 30 Rep 39 Posts Drives: 2012 328i Sport Line Join Date: Apr 2015 Location: Singapore iTrader: (0)	That's really bad mpg. I get 23mpg out of my 328i with about 80/20 city/highway driving. __________________ 2012 Glacier Silver F30 328i 18 x 8.5 Square Apex SM-10 \| 245/40/18 Michelin PS4 \| F8x LCA \| Red M Performance Brakes \| F80 Steering Wheel \| VRSF 5" HD FMIC \| Full FTP Piping
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07-22-2021, 06:21 AM	#6
mmm-five First Lieutenant 222 Rep 375 Posts Drives: 2006 Z4MC + 2015 320D M-Sport Join Date: Aug 2017 Location: Liverpool, UK iTrader: (0)	Something's not right there...I get more than that out of my Z4M around town. Is this what is showing on the OBC, or from a tank-to-tank measurement, as the OBC can be wildly inaccurate.
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07-22-2021, 07:33 PM	#7
Wires Brigadier General 1646 Rep 4,876 Posts Drives: 2016 340i xDrive Join Date: Apr 2008 Location: Calgary iTrader: (0)	How are you measuring that? Actual mileage vs gasoline pumped in, dash display, etc? When we took delivery of our 2008, and it was "brutal" for mileage on the dash display until I reset both keys (IE 10MPG around town). It's like it the ECM logged a ton of fuel consumption with no mileage.
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