1000 miles before Millers and 1000 miles after.

[Will]

Car: 2004 Audi A2 1.4 TDi (75PS) 60k miles

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.

 

[dan_b]

Hmm. Not what I was expecting either. Let us know how you get on with the next 1000 miles! And I've just bought a new bottle too...

 

[Will]

Hmm. Not what I was expecting either. Let us know how you get on with the next 1000 miles! And I've just bought a new bottle too...

I'll keep the thread updated. At least you didn't buy 5 litres of the stuff! Doh.

There are still the cleaning properties to be appreciated.

 

[dan_b]

Ha, no good point - just the small bottles from Halfords. I've been running it in my car for over a year now though, will be interesting to see if there genuinely is a before/ after effect.

 

[Rich.]

I'm going to go back to using redex for now, i've had millers in for about 1 year too

 

[wngl]

Hmm. Not what I was expecting either. Let us know how you get on with the next 1000 miles! And I've just bought a new bottle too...

Same here! I bought the 5 litre pack after seeing good reviews from various forum, but have noticed that I was getting less MPG from the on board computer and have stopped using it after about a year after the Which? report on fuel additives where it found no noticible improvement with any of the fuel additive they tested (including Millers).

Will be following this thread with great interest as I haven't been bothered to keep filling the 500ml bottle from the 5 litre pack! (Too much effort for no noticeble gain).

 

[the grim reeper]

Are you only using your on board mpg or do you work it out manually ? Its just looking at your figures is that to tank of fuel or just fill ups

Cheers Phil

 

[Will]

Are you only using your on board mpg or do you work it out manually ? Its just looking at your figures is that to tank of fuel or just fill ups

I work the figures out manually by filling the fuel tank up.

I typically fill-up even though the tank at times is only half full. This helps me records mpg vs temperature and also because I mostly do long journeys so like to begin on a full tank.

This morning was my first without Millers and from the fuel gauge alone it looks like I'm getting >70mpg. I'll fill up on Friday to get a more accurate figure.

 

[Will]

Update to the list:

Fill-ups without Millers:
5/3/10 - 300 miles – 71.8 mpg (temp. ~5C)
12/3/10 - 295 miles – 72.5 mpg (temp. ~5C)
19/3/10 - 310 miles – 76.2 mpg (temp. ~15C)

Fill-ups with Millers:
26/3/10 - 300 miles – 66.5 mpg (temp. ~10C)
1/4/10 - 300 miles – 68.2 mpg (temp. ~10C)
5/4/10 - 440 miles – 66.7 mpg (temp. ~15C)

Fill-ups without Millers:
9/4/10 - 325 miles - 70.4 mpg (temp. ~15C) mixed driving with traffic
16/4/10 - 405 miles - 70.8 mpg (temp. ~15C) slow puncture

23/4/10 - 370 miles - 70.1 mpg (temp. ~15C)

I'm not too sure why the car is now no better than in mid March with the colder weather.

Is there an optimal ambient temperature where the turbo charger is at peak efficiency?

The more I look at the results the less clear I am of understanding them.

With the ECU remap next week I'll hold off using Millers again and run the car another 1000 miles post remap to measure that difference. Then finally return to Millers once more.

Ignorance is bliss surely

 

[bretti_kivi]

I'd be sceptical of numbers that are derived from different pumps, as tolerances can be quite large.

5C is probably around optimal for Turbos as it's going to enable better air compression. OTOH, the aircon might be taking more heat from the engine, whereas at 15 it doesn't need to.

I'd say that even without any more information, that shows that for you with your drive profile, Millers does not help and actually worsens your numbers. It's possible that the Millers is not out of the system yet - because you dilute - and therefore I'd leave it a while before re-testing.

Bret

 

[Will]

Thanks for the feedback Bret.

For info. all the fillups were at the same petrol station.

The ECU remap I have planned for next week-end should prove interesting. Though my ambition of 80mpg is looking less likely these days.

 

[Adrian888]

Interesting data, my economy has also improved noticably after a not very scientific use of Millers. However the warmer weather has also kicked in so it is very difficult to annalyse correctly. What i have noticed is there appears to be a notable improvement in economy when the ambient temperature rises above 50 Farenheit (sorry don't do the other scale!).

 

[Will]

Update to the list:

Fill-ups without Millers:
5/3/10 - 300 miles – 71.8 mpg (temp. ~5C)
12/3/10 - 295 miles – 72.5 mpg (temp. ~5C)
19/3/10 - 310 miles – 76.2 mpg (temp. ~15C)

Fill-ups with Millers:
26/3/10 - 300 miles – 66.5 mpg (temp. ~10C)
1/4/10 - 300 miles – 68.2 mpg (temp. ~10C)
5/4/10 - 440 miles – 66.7 mpg (temp. ~15C)

Fill-ups without Millers:
9/4/10 - 325 miles - 70.4 mpg (temp. ~15C) mixed driving with traffic
16/4/10 - 405 miles - 70.8 mpg (temp. ~15C) slow puncture

23/4/10 - 370 miles - 70.1 mpg (temp. ~15C)

Fill-ups without Millers:
30/4/10 - 300 miles - 77.9 mpg (temp ~15C)
7/5/10 - 390 miles - 70.9 mpg (temp ~10C) ECU REMAP!
14/5/10 - 295 miles - 74.5 mpg (temp ~10C)

New shorter commute to work - Fill-ups with Millers
6/6/10 - 543 miles - 65 mpg
2/7/10 - 562 miles - 69 mpg

I'm surprised how well the mpg is holding up considering my commute to work is only 10 miles and I now do much more mixed driving than before. Whether that's due to the remap, the Millers, or just what the car naturally performs i don't know, but I'm happy to take it.