Real MPG for 20i & 28i

[Anonymous]

Now at 23.3 MPG! BMW lied, Majorly!

I think they all do, My 991S on v-power does 9.8 from cold for the first 10 miles then 20.1 thereafter all on rural roads and no town driving, this is nothing like what's quoted by Porsche.

I think you should just enjoy the car

 

[dhplachy]

Less Cylindars and CC will result in better consumption in the most part but as I've said all along and it frustrates me that people don't seem to get this, it's all about how the car is driven and under what circumstances. Mostly stop start city will result in awful figures, mostly a roads or motorways will result in superior figures so one person really can't compare against another unless they drive the exact same way on the same roads etc...
:\

Maniac is spot on.

This is all relative.

I have a 750iL V12 and routinely get 24 mpg on the highway and if I really want to feather it on hills, etc., I have easily made trips on the highway of 29 mpg and that is with a very large and heavy car with a 5.6L engine. I am therefore amazed at German engineering that they can get that kind of fuel economy with a V12.

My guess is that since these N20 cars are still new they are way too tight to get the type of mileage that you are expecting.

It's also a sports car, and if what is desired is fuel economy, then the Mini would be a better choice. :?

 

[Anonymous]

It's also a sports car, and if what is desired is fuel economy, then the Mini would be a better choice.

This is true, and coming from diesel 1 series, seeing under 30mpg was a shock.

I know that the mpg figures quoted by BMW are not accurate, but surely if they are too far out, then thats mis-leading.

The appeal of this car was that it is a sports car with mpg that I can live with - kinda like "best of both worlds", but if the mpg is going to be under 30 then I will find it too expensive to run. Even accepting 30 is quite a drop from the 40+ quoted by BMW.

 

[Maniac]

Do they quote 40+? ... I thought it was like 30 something urban, 40 something combined (which means half urban half motorway use), and 50 something motorway? Usually to achieve these figures you have to drive like miss daisy but it is possible. If you're driving mostly urban, then you're about right?

Mine was quoted 20 something urban, 30 something combined, and 40 motorway, and, that's roughly what I get, as its mostly city driving and a few longer roads, I get mid 20's mostly. Up to 40 on a motorway / long run / driving like miss boring!

 

[Anonymous]

Do they quote 40+? ... I thought it was like 30 something urban, 40 something combined (which means half urban half motorway use), and 50 something motorway? Usually to achieve these figures you have to drive like miss daisy but it is possible. If you're driving mostly urban, then you're about right?

Mine was quoted 20 something urban, 30 something combined, and 40 motorway, and, that's roughly what I get, as its mostly city driving and a few longer roads, I get mid 20's mostly. Up to 40 on a motorway / long run / driving like miss boring!

Actually, thats a good point....I conveniently forgot the 40+ was the combined figure.

Ooops.... :?

 

[JDM]

I have just over 300miles on the clock and the OBC is showing 32.8MPG at present with a good mixture of town and motorway driving. I am impressed with that to say the engine is still very tight

 

[Andrew*Debbie]

Now at 23.3 MPG! BMW lied, Majorly!

I don't know if they lied exactly. Who conducts the tests?

The VCA numbers are unrealistically high for just about all cars in all real conditions.


But as I noted before, they are way way off on the sDrive20i. VCA says our car should use about 16% more fuel than our MINI did but so far our consumption is far higher.

I suspect BMW designed the N20 specifically to do better on the official CO2 tests. I'm happy to have a car in Tax band G instead of J. Just a bit surprised that the real world fuel usage is close to what a car in Band J would do. The Z is a big heavy car with wide tyres. Maybe there is only so much magic that a 4 cylinder engine can do.




The OBC on our Z4 has been reading high. Three tanks now and the OBC has been reading several MPG higher than what I'm computing. Has anyone else compared the OBC numbers to what the car is actually doing?

 

[Anonymous]

My first tank said 31 on the car, but 27.9 in fuelly, but that was the first tank and I doubt it was brimmed to begin with.

Also, in idrive I found the stats for "journey" and I've not reset this. It says 2 miles MORE than the car has actually done?

 

[Andrew*Debbie]

sigh

 

[Anonymous]

Is that meant to make us jealous? If so, not working, cos you might have better mpg, but they put the wrong dash in your Z4!!!!

 

[JDM]

Is that meant to make us jealous? If so, not working, cos you might have better mpg, but they put the wrong dash in your Z4!!!!

 

[Allattar]

Had a drive up to Yorkshire just the last two days and for the purposes of science I shoved the cruise control on at 75 mph and tried to keep it there.

I was good the whole way. Ok I had to accelerate a little bit to move past some traffic, and not get in the way of anyone else using the motorway. I refused to be one of those drivers who pull out at 65 mph and stay at 65mph crawling past the lorry. If your going to go past, you have to go past and not trap the other driver or cause a logjam.

There and back to Brum, about 30 odd miles or more non motorway driving and my mpg was reading 39.6. Sure thats likely to be an overestimate but at least within 1-2mpg.
I got 230 miles out of half a tank roughly.

It will be interesting to see what it gets to after I fill up again, now im back to the usual commute.

Other things I noticed. Apart from the odd lorry, and the ancient fiesta I was the slowest thing on the motorway. Not by much, but everyone else was passing me at 75.
So that 80mph suggested increase to the speed limit would change bugger all as far as I can see.

oh, and it was boring...

Obviously in the name of science I need to test other velocities on the cruise control. Say 70, 80, 85, 90. I might not look forward to the 65 mph study

 

[Dave-2912]

My first Fuelly reading is in and I used 38.16 litres (8.39 UK gallons) to cover 299 miles. So that makes it 35.6mpg. The OBC hasn't been reset since I got the car so it says my average is only 34.4mpg.

My mileage is probably made up of 50% motorway, 40% town and 10% backroad blast. So I think 35.6mpg (and rising) isn't too bad at all.

 

[KeithJ]

My OBC reads 23.9. I live near hills, traffic lights and people who piss me off on the road. It's correct

 

[moonshine]

My OBC reads 23.9. I live near hills, traffic lights and people who piss me off on the road. It's correct

 

[Dave-2912]

My OBC reads 23.9. I live near hills, traffic lights and people who piss me off on the road. It's correct

I lived with this kind of mpg when I had my Focus ST but petrol prices were cheaper then (2007-2009). Not sure I could afford to do my usual mileage in such a thirsty car with the current petrol prices.

 

[Allattar]

My OBC reads 23.9. I live near hills, traffic lights and people who piss me off on the road. It's correct

Oh good its not just me then that feels the need to get well away from people who piss me off on the road.

 

[JDM]

My OBC is curently showing 35.8 MPG with just over 1100 miles on the clock.. I'm a very happy chappy

 

[Andrew*Debbie]

Guess I shouldn't have drunk BMW's N20 koolaid. The 23i has Valvetronic. That already reduced the pumping loss. Reducing pumping loss is one of the reasons smaller displacement engines use less fuel. The same is true for diesels. Auto stop and a little bit less mass in the engine is only going to get you so far in real stop and go.


I'm taking Debbie to Manchester airport in a few weeks. I'm sure the car will do much better on the motorway. But will it live up to the paper specs? Probably not.


The US EPA disputed BMW's claims for the N20 powered 328i. BMW originally claimed 24/36 mpg-US. EPA retested the car and told BMW to change that to 23/33. (US number are always lower than UK because the tests have different drive cycles and the US gallon is smaller.)

The 328i sedan is the only N20 car retested by the EPA.


http://www.bmwcca.org/node/4008

 

[Anonymous]

Got to fill my car up again soon (about 20 left on the range!) and I've done just over 300 miles since last fill up, so looking like it will be the same rubbish economy. But most of my trips are short and cold engine, so its probably not the cars fault.