Winter diesel gives less MPG?

[wild camper]

In a recent topic Mike replied that winter diesel gives less MPG
I’ve noticed that recently my dashboard display has been showing reduced mpg, I thought it was because I’m carrying a lot of weight in tools while I refurbish a house, I’ve now emptied the van but am still getting about 2mpg less.
I hadn’t heard before that winter diesel gives reduced mpg, is it in the garages now?
Perhaps Mike could expand on the reason for this (the reduced mpg)

[Dementinator]

I,m No expert on Diesel but I am going to guess it will have something to do with the additives used to prevent waxing in cold weather.
I would imagine the garages with high turnover are already using this.
I seem to average around 37mpg in a new 170PS auto ltd, whereas 42mpg was my average in the previous 155PS 2015 van.
I expect that is as much to do with a new engine and auto transmission etc, but could be due to the fuel also.

[Mike]

it will have something to do with the additives used to prevent waxing in cold weather.

Yep, it’s as simple as that.

[Nederbelg]

And whith the colder wheather which comes whith the winter diesel

Gr Nederbelg

[Mike]

And whith the colder wheather which comes whith the winter diesel

Gr Nederbelg

That’s true with diesel engines, but the temps in England aren’t having an effect yet, it’s purely down to the winter diesel being sold. It’s not even cold enough to put the winter tyres on yet.

[bigjohnthomas]

It's all about your cloud point you know

[richbee]

it will have something to do with the additives used to prevent waxing in cold weather.

Yep, it’s as simple as that.

What???

Is this really a thing?

I always assumed it was just due to the temperature drop, harder work to turn over a cold engine

[richbee]

it will have something to do with the additives used to prevent waxing in cold weather.

Yep, it’s as simple as that.

What???

Is this really a thing?

I always assumed it was just due to the temperature drop, harder work to turn over a cold engine

Well you learn something new every day

https://en.wikipedia.org/wiki/Winter_diesel_fuel

[bambi mk 1]

And whith the colder wheather which comes whith the winter diesel

Gr Nederbelg

That’s true with diesel engines, but the temps in England aren’t having an effect yet, it’s purely down to the winter diesel being sold. It’s not even cold enough to put the winter tyres on yet.

So would it be a good idea to remove your intercooler

[bat666x]

I have noticed a drop in MPG recently and always thought that it was because there was more cold dense air available at winter? I assumed that with colder denser air the engine would be automatically be injecting slightly more fuel to keep the fuel/air ratios correct

seems the only dense thing here is me

[hughesyn]

I have noticed a drop in MPG recently and always thought that it was because there was more cold dense air available at winter? I assumed that with colder denser air the engine would be automatically be injecting slightly more fuel to keep the fuel/air ratios correct

seems the only dense thing here is me

Diesel engines don't maintain the air fuel ratio. Petrol engines do. The job of a carburetor or fuel injection system in a petrol engine is to keep the air fuel ratio close to the ideal stoichiometric ratio 14.7:1.

A diesel engine injects as much fuel as demanded. The limit to the amount of fuel is when there isn't enough air to burn it properly. That's why tuning diesels too much (increasing fuel for given revs) can result in smoke from the exhaust.

[Mike]

MPG has improved with the last two tanks of fuel, summer fuel is back at Shell.

[Altransit]

MPG has improved with the last two tanks of fuel, summer fuel is back at Shell.

Definitely, this was after my last fill up and a 65 mile, 70mph journey home.....

CIMG3810.JPG

It was 39.2 until I hit the local roads, with the myriad of roadworks and traffic lights

[V184]

MPG has improved with the last two tanks of fuel, summer fuel is back at Shell.

Definitely, this was after my last fill up and a 65 mile, 70mph journey home.....

CIMG3810.JPG

It was 39.2 until I hit the local roads, with the myriad of roadworks and traffic lights

Is that from your scabby mk7 in your picture

[bigjohnthomas]

Interestingly
when you look at the refineries the pipelines and the storage places
It must take some time to alter the mixture
There's got to be a billion gallons just in the underground pipes
http://www.ukpia.com/docs/default-sourc ... f?sfvrsn=0