This variant with the six new "smaller" bottles of 1.275 l currently costs 15.90. The 6 bottles contain 7.65 liters along with a price of 2,01 / liter.
Comparing prices per liter with the offer prices of 3L from the supermarket (6.99) and the 3l here on Amazon shows that this variation is by far the cheapest. Thus Burti costs at the supermarket on offer usually 6.99 to 3 liters, which corresponds to a liter price of 2.33 euros. The same 3Liter articles from Amazon comes at a price of 3.90 per liter in the flash range is still 2.94 / l (Listed price: 8.81).
The 7.65 liter that the package also includes are a lot that you can use up in the foreseeable future. Therefore buy recommendation!