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Have you reset it recently? It sounds like you have your MFD set to "set 2" which is the long term data set (only resets manually). If you push the button on the end of your wiper stalk then it should change to set 1 which is the "single trip" set, this resets after the engine has been off for two hours. If you've never reset the long term data then you might find it's across multiple tanks even from before you owned the car, but the single trip readout will give you results just from your commute home and may be higher.
Shouldn't do any harm if used properly.
May not make a huge difference.
As stated, I'm not a fan of aftermarket additives. I'd try a premium diesel first if I was that bothered, which i'm not.
Some peeps see a difference, some don't.
Conks
I tend to stick to the oil majors. I'm not that fussy about where I fill. Generally Esso or BP as its on the way to work!
If you are on a serious economy drive, you can generally get bigger gains by adjusting your driving style rather than buggering about with fuel
From what you have said though, your economy on short hops seems OK. Get it on a good motorway run or flowing country drive and you will see nice numbers on the display as long as you don't go mad with the throttle(?)
I get 52mpg on the display from my 140Bhp Exeo. Best on my 38 mile commute was just over 60mpg. I drove like a proper shandy drinker though.
Conks
just going back to the point about noticing the effect of millers or premium.. If your cars highly tuned, then you need to put it in. End of...as damage can be done internally. but the debate is on with std, mid powered diesels. If i put std diesel in mine, the power is noticeably different within a few dozen miles or so of the new untreated tank![]()
i've just put millers in my 150 cupra tdi, will report results in a week or so when i next have to fill up!
just going back to the point about noticing the effect of millers or premium.. If your cars highly tuned, then you need to put it in. End of...as damage can be done internally. but the debate is on with std, mid powered diesels. If i put std diesel in mine, the power is noticeably different within a few dozen miles or so of the new untreated tank![]()
I don't bother.
I just avoid supermarket diesel.
If bothered i'd use premium fuel from an oil major.
Conks