535d fuel consumption

[rossfitz]

I'm trying to improve the above by using decent (non supermarket) fuel and Millers additive, but I'm finding that fuel efficiency improves on the computer after I've had a quick blast. Anyone else had this and know what the reason might be?

[Welshbeef]

How old is your car how many miles?
It could be that the injectors are not 100% working due to partial clogging so rather than a fine spray they drip that uses more fuel for the same performance and causes more black smoke.
These additives can unclog them thus restoreing them

[rossfitz]

2005 35,000 miles. My bet is that it's had average quality fuel most of its life, so lets hope this Millers can clean up the nozzles.

[///MrSingh]

I filled the tank with Shell V power diesel, used most of it and then went back to regular Shell diesel - seemed to improve the economy by a couple of MPG