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1000 miles before Millers and 1000 miles after

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wemorgan

MB Enthusiast
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Apr 5, 2008
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A205 C220d
Car: 2004 Audi A2 1.4 TDi (75PS) 60k miles

Sorry for not being a MB, but hopefully it's still of interest to some.

Fill-ups before Millers:
300 miles – 71.8 mpg (temp. ~5C)
295 miles – 72.5 mpg (temp. ~5C)
310 miles – 76.2 mpg (temp. ~15C)

Fill-ups after Millers:
300 miles – 66.5 mpg (temp. ~10C)
300 miles – 68.2 mpg (temp. ~10C)
440 miles – 66.7 mpg (temp. ~15C)

The figures aren’t quite what I was expecting. But I’m now going to drive a 1000 miles without Millers to see what happens next.
 
wemorgan said:
Car: 2004 Audi A2 1.4 TDi (75PS) 60k miles

Sorry for not being a MB, but hopefully it's still of interest to some.

Fill-ups before Millers:
300 miles – 71.8 mpg (temp. ~5C)
295 miles – 72.5 mpg (temp. ~5C)
310 miles – 76.2 mpg (temp. ~15C)

Fill-ups after Millers:
300 miles – 66.5 mpg (temp. ~10C)
300 miles – 68.2 mpg (temp. ~10C)
440 miles – 66.7 mpg (temp. ~15C)

The figures aren’t quite what I was expecting. But I’m now going to drive a 1000 miles without Millers to see what happens next.
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:confused:

Not what I would expect Will. It's as though you've posted the figures back to front (I know you haven't).

As stated in previous posts, I've never seen any marked increase in the figures with my 320CDI but the Sprinter does improve considerably with Millers.

I would be inclined to contact Millers with the information to hear what they have to say. :devil:
 
ringway said:
:confused:

Not what I would expect Will. It's as though you've posted the figures back to front (I know you haven't).

As stated in previous posts, I've never seen any marked increase in the figures with my 320CDI but the Sprinter does improve considerably with Millers.

I would be inclined to contact Millers with the information to hear what they have to say. :devil:
Click to expand...

Originally as you know I wasn't really anticipating a gain in mpg and would have been happy with the cleaning benefits alone. But the results do confuse me a bit, especially as the change is so significant and 2 of my 3 fill-ups were simply doing my weekly commute, so same traffic conditions etc.

I'm inclined to just carry on with my test for now. Next 1000 miles without Millers, then 1000 with and see how it goes.
 
Have to disagree with my own experiences.

I found and not scientifically tracked it that after using millers for 1k miles I do see a slight improvement in the cars overall performance, maybe 5-10% tops.

I used it all last summer and after 3 tanks of the stuff it seemed to use a lot less fuel 10-20% less on my commute, and haven't used it recently for about 1k miles but have resumed and the car seems a little better, but that could be the weather.
 
I think what we are seeing in the OP is the Millers cleaning out the fuel sysem deposits, this actually has the effect of lowering MPG if the system is particularly dirty and this can ocur for 1k - 2k after you start with Millers.

My Volvo has been on Millers from new and has now covered 38k and its long term average is 59.8 mpg, best it has ever done is 76mpg (tank to tank) but it is definitely smoother and more powerful with Millers
 
I do find the figures surprising.
I always use Millers in both E300TDs.
But - I have never done a comparator trial on these cars.
I did trial my previous Jeep diesel, and found an improvement both in mpg and smoke.
The E300TD is certainly quieter.
I noticed this when we bought the second one.
On collection, it was noticeably more noisy than the one that we had run on Millers for a year.
On the first fill-up, I used Millers and the rattle reduced appreciably.
They both run very well with Millers.
Both are quiet and clean.
Smoke is never a problem (but then, it rarely is with these OM606 engines).
Please keep us updated.
(Especially, as I was the source of the Millers)
 
Interesting.

I have just used Forte on my 95,000 mile E280CDI and noticed the diesel mileage was lower while it was in the tank (and some grey smoke while doing a "hillclimb" every 50 miles or so to help the cleaning process).

A lot perkier now though!

(did the A2 respond to the Millers' Cetane boost and allow its owner to "get there a bit quicker" while it was in the tank?)
 
w124coupe said:
(did the A2 respond to the Millers' Cetane boost and allow its owner to "get there a bit quicker" while it was in the tank?)
Click to expand...

I think I was driving it much the same as I previously did, 60mph with cruise control on, plus usual acceleration from junctions etc.

This morning's 150 mile journey was my frist without Millers, though there will still be some from the previous fill-up and already I've noticed an improvement in economy. I'll fill-up on Friday for a more accurate measure.
 
w124coupe said:
You could also try BP Ultimate - they claim higher Centane numbers plus cleaning as well.
Click to expand...

Thanks, I had wondered about that. Millers costs me 1p extra per litre, BP Ultimate a little more sadly. I will give it a try though, just for the hell of it.
 
wemorgan said:
The figures aren’t quite what I was expecting.
Click to expand...

How far apart are those two sets of figures? Just wondering if the "good" set might have been with summer grade diesel and the bad with winter diesel.

My understanding is that additives are put in diesel in the winter months to prevent the fuel waxing but this is known to lower the fuel economy by up to 10%.
 
gazzz said:
How far apart are those two sets of figures? Just wondering if the "good" set might have been with summer grade diesel and the bad with winter diesel.

My understanding is that additives are put in diesel in the winter months to prevent the fuel waxing but this is known to lower the fuel economy by up to 10%.
Click to expand...

And also the colder temps mean more energy is lost as heat
 
gazzz said:
How far apart are those two sets of figures? Just wondering if the "good" set might have been with summer grade diesel and the bad with winter diesel.

My understanding is that additives are put in diesel in the winter months to prevent the fuel waxing but this is known to lower the fuel economy by up to 10%.
Click to expand...

I typically fill up once a week, with the latest fill=up (bottom figure) being this week.

That's a good point about the winter-summer grades of diesel.

Hopefully the repeated 1000 mile tests should filter out those anomalies.

Generally I find recording and quoting mpg figures quite tricky as there are so many factors to consider it can often be misleading to quote them.
 
*** said:
And also the colder temps mean more energy is lost as heat
Click to expand...

Does this necessarily make a turbo-charged diesel engine with an intercooler and a cooling system with a temperature-controlled fan less efficient ?

I'm not asking this because I know the answer.
I suspect it's not as straightforward as we may think.
icon5.gif
 
johnsco said:
Does this necessarily make a turbo-charged diesel engine with an intercooler and a cooling system with a temperature-controlled fan less efficient ?

I'm not asking this because I know the answer.
I suspect it's not as straightforward as we may think.
icon5.gif
Click to expand...

I would say so, especially from a cold start simply as it will take longer for the engine to warm up, and there is still that heat loss which is lesser as temp rises. All that will happen is the fan will work less hard when cool.
 
I presume that the Diesel Power Ecomax has replaced Diesel Power Sport 4??
 
I think they've just changed the name to make it appear ECO-friendly.
 
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