Does anyone know where you can buy this in bulk to take away in 25Ltr drums for example? Only seen it in 5 Ltr so far and it's expensive.

Oil used to run a central heating system is usually delivered by a small tanker (usually with a minumum delivery of 250 litres or in some places 500 litres) and is the same price per litre for 1 or 1000 litres.

It's not for central heating and I can't have it delivered to my house so need to collect but only seen small tubs for sale in DIY shops.

Is it for vehicular use?

perish the thought!

I have the recipe and used to make my own diesel substitute in the UK, worked out around 25p / litre and I'm on the look out for a car so thought I'd save myself a few quid.

Gasolio "B" is for heating/industrial use & they will deliver from 100 litres to our villa, the price will drop the bigger the order (can only speak for my area)

25:1?

did you find it wears the pump and injectors quicker than normal lubed diesel?

different ratio using kerosene and another product.
Had an Isuzu Trooper 3.1TD in UK and put around 50 000 miles on the clock with this mix with the occasional trip to the pumps. Found acceleration improved, quieter engine and no reliability problems. Didn't bother the turbo either unlike the recycled food oil used to do.
Admittedly the pre 1996 Isuzu Trooper 3.1TD was as reliable as a wood burning stove but can't say for sure how this fuel would run on a HDI or other modern diesel engine.

wouldnt have thought the newer engines would run for very long! they have high tolerances for fuel lubrication compared to any of the old mechanical engines like isuzu's and landys etc
would be interested to know exactly what your other additive is? ran an old old landy on anything i could put in it years ago - used to fire up on pretty much anything even a TVO mix!