At stand d26 i have about 1.35 GB of vas left. That's with global, openlc and vector and ut2 with 20 percent airline traffic (no ga) and asn.
In vector I have secondary , tertiary and railroads disabled. Also everything like golf courses, power lines, beaches and frozen water in winter is disabled.
Nl2000 with autogen.
Flying from eham to aerosoft egll I have 700 Mb of vas left at the gate in Heathrow with these settings. So Theres room for higher settings.
Lod = high
Texres = 30 cm
Scenery complexity = high
I have also tried without nl2000, so just orbx, and vas usage is about the same.