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Discussion Starter · #1 ·
Hi All,

New here, I've had my 118i M-Sport Automatic from new since January.
I have done 8000 miles in it, 90% of it Motorways going normal speed at 60/70 in Eco Friendly.

For the first 4 months my MPGs were at 29/30 they have now somehow managed to creep up to 41.5 MPG.
My biggest problem is this, I see myself put a full tank in every 3/4 days. Now, reading BMW website the fuel tank capacity should be 42 L. I have never been able to put in more than 34. 35 at a push, you know when the handle clicks and you go a little more.
This gives me a range of 300 miles where I've seen online show 450+...

Is this normal, should I really expect my fuel tank capacity to be 35 L and my Maximum Range 300 miles?
I understand if I am completely in the wrong and just haven't been educated on this and I will appreciate any answer I can get but if however, fellow 118i owners can in fact put more than 35L of petrol in theirs, and after every full tank they get more than 300 miles to show at start of their journey (i know this is average but on average i would say i squeeze about 350 miles in TOTAL before refuelling) then I will either have to book in for some tests at BMW or consider changing the car entirely as it's annoying having 2/3 trips of total of 300 motorway miles and going straight into the petrol station.

In comparison, before this I owned a 116d Sport Diesel and that allowed me to put about 50/52 L Diesel in and even though the Range started at 500 I'd get about 700 motorway miles from it (I know it's diesel but still, If not the range, then the fuel capacity issue rises)

Any help would be greatly appreciated
 

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A larger 50l tank is an option on the F40 1 (though is standard fit in the M135i), so potentially those cars showing 450mile range online have the larger tank?

I filled up my larger tank this morning and only got 42l despite the fuel gauge reading that it was almost empty. Seems quite a large safety buffer is built in.
 

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Discussion Starter · #3 ·
A larger 50l tank is an option on the F40 1 (though is standard fit in the M135i), so potentially those cars showing 450mile range online have the larger tank?

I filled up my larger tank this morning and only got 42l despite the fuel gauge reading that it was almost empty. Seems quite a large safety buffer is built in.
Thing is though, what is that safety buffer, how far can I go at 0 range😂
 

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Thing is though, what is that safety buffer, how far can I go at 0 range😂
I did experiment with this once. I got actually quite far, probably 15ish miles of very frugal driving before I eventually caved in.
 

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Discussion Starter · #5 ·
Either way. I've not come across anyone yet online who can't put in more than 35 L of fuel in, so would be interesting to see if I in fact have bad some extra bricks chucked into my tank or if maybe my buffer is 7 L to take it to the 42 L capacity as stated online.

i know someone mentioned M135s having 50L tanks, however when ordering my car I've not once even been asked or told about this when doing the order. I just stupidly assumed i'd get a largish tank like I had in my 116d which was about 50 L...

thanks for responses so far though chaps
 

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I've ran low before and was some way from petrol station, made it and ended up putting 49.6l in my M135i 50l tank.
 

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Either way. I've not come across anyone yet online who can't put in more than 35 L of fuel in, so would be interesting to see if I in fact have bad some extra bricks chucked into my tank or if maybe my buffer is 7 L to take it to the 42 L capacity as stated online.

i know someone mentioned M135s having 50L tanks, however when ordering my car I've not once even been asked or told about this when doing the order. I just stupidly assumed i'd get a largish tank like I had in my 116d which was about 50 L...

thanks for responses so far though chaps
I have a 118i MSport with 42 litre tank. I put in 40 litres last week when indicator was showing 20 miles remaining. Cost £75 @ £1.88/litre.
 

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I know you're asking about tank capacity but I'd be seriously investigating your fuel economy. If I do mostly motorway/dual carriageway at 75-ish mph in Comfort making zero effort to save petrol I'll get 42-45mpg. Through long roadworks at 60 it will nudge 50mpg. In a 128ti ... I'd have though in a 118i you'd get quite a lot better especially at 60/70 in Eco.
 

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Discussion Starter · #10 ·
By the sounds of this, i drive like you. Everywhere. Motorways or Cities (90% motorways) mostly using the automatic 70mph button so i dont even play with acceleration tbh and im at 42.6 right now... i consider myself a light, very light footed user.. to a point where i haven't even had courage to floor-it as it's pointless and i know it'll eat thru petrol.

funny thing i fueled up today (lucky me found astation which charge 178.9 a litre kn letrol) and i got to 430 range on miles... first time ever above 320...
 

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I have done 8000 miles in it, 90% of it Motorways going normal speed at 60/70 in Eco Friendly.
I think you might have bought the wrong engine for the driving that you do.

In my experience, small petrol engines perform best on short journeys or when driving at 40-50mph. Cruise at 60-80mph and the mpg will disappoint and be inferior to cars with larger engines. Would you consider a Diesel engine?
 

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Discussion Starter · #15 ·
I think you might have bought the wrong engine for the driving that you do.

In my experience, small petrol engines perform best on short journeys or when driving at 40-50mph. Cruise at 60-80mph and the mpg will disappoint and be inferior to cars with larger engines. Would you consider a Diesel engine?
oh yeah! Totally 100% when i ordered my car my job was from home. Then mid way thru all this postponing by BMW "your order is on hold due to shortages" I got a job offer that requires me to go out on the road and it was already too late to make changes 🤦‍♀️ Thing is the "long" journey i do cruise at 60-70 but i do understand Diesel engines are the way forward for longer journey.
 

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I think you might have bought the wrong engine for the driving that you do.

In my experience, small petrol engines perform best on short journeys or when driving at 40-50mph. Cruise at 60-80mph and the mpg will disappoint and be inferior to cars with larger engines. Would you consider a Diesel engine?
Unfortunately not quite correct as our 1.0l fiesta get it's best mpg at 60-70mph and recently I had a Kia Rio hire car that did over 60mpg also at 60-70mph. Its how you drive them really...
 

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Unfortunately not quite correct as our 1.0l fiesta get it's best mpg at 60-70mph and recently I had a Kia Rio hire car that did over 60mpg also at 60-70mph. Its how you drive them really...
That's superb for a 1 litre! Makes me miss my 2017 1.2L Fabia. 20 quid of fuel lasted weeks in it!

I would also add that some engines need 30-40min of warning up before they start achieving their optimal mpg. Hence why some taxi drivers love doing airport transfers and clock 600-700 miles per full tank, mainly driving on motorways.
 
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