I have a DC2R

GT3037S (480hp turbo) 204kw @ wheels.

When I measured mine I got 430kms plus from a 50Lt tank....

So I got about 11.4L per 100kms.

Thats boosting where I could, no granny driving.

Its gonna depend on your setup and definatly your tune.

Just because your putting on a turbo does not mean its gona drink heaps more fuel.