i have just used some millers sport 4 for the first time. i cant really notice any difference. does it take time for it to set in or somthing? also ive put in double strength.

I suspect it will take time. Mine's actually caused a drop in mpg as I guess it was used to the old stuff I used - Also, I think my propane has run out...

Over time I suspect the car will adapt to it.

It took about 50 miles or so to notice a bit more responsiveness with mine.

A drop in MPG could be due to the anti-gelling agents that fuel companies add to their diesel during winter months.

Repost but people may have missed it

Response from Millers re my question about Power Sport 4 usage for Euro III diesels :-

(text extracted from email and accompanying PDF)

Thank you for your recent enquiry. I would recommend using Diesel Power Sport 4 as Diesel Power Plus will soon be obsolete.

Please find attached data sheet.

Mike Fenton - Technical Services Manager

PRODUCT NAME/VISCOSITIES:

DIESEL POWER SPORT 4

DESCRIPTION:

Performance Diesel fuel treatment for enhanced combustion efficiency in modern Euro IV compliant engines.

APPLICATION:

By addition to fuel in the ratio 1 part to 1000 parts [1 ml/ltr]. May also be used at double strength for additional performance

USER BENEFITS:

Millers Diesel Power Sport 4 is a modern state of the art fuel treatment that is suitable for all diesel engines, especially Euro IV, emission compliant vehicles, whilst also providing a tangible improvement to vehicle performance.

Better than new performance

Features a unique combustion efficiency improver and Cetane booster

Improved throttle response

Protection of fuel system components against wear, with specially added lubricity enhancers.

Detergency for prolonged injector cleanliness.

Engine smoothness, noise reduction and fuel savings confirmed by users

Reduces emissions

Fuel system corrosion control.

Prevents fuel from ageing

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So, suitable for all diesels - and the old Power Plus to be phased out.