6p isn't that much
So why complain to us about paying 140p a litre?
but if it prevents my EGR getting clogged, which then leads to my intake manifold getting clogged up also, surely it could save me money in the long term for any potential work needing to be done.
Do you honestly think you are preventing a large bill by using a different type of fuel on a 120d? You actually think that?
If you are that worried about big bills with a diesel you drive around town why don't you sell it and buy a petrol one - then it'll sound even more quiet around town and the fuel is even cheaper.