Im running a stock P30 (B16A) basemap on a chipped P08 at the moment, its running lean imo, avoiding to drive in this situation and if I get any chance to drive Im not letting go the RPMs above 3k. Perhaps, I cannot comment anything right now. Waiting to get hands on my wideband, tuneup after that and then I will give a statement on the mileage thingy.
And yes I agree on your query, some friends are running H22's and H23's on these lighter chassis and they easily fetch 12-13 on hypermiling and 5-7 on high revving so my expectation with the F is the same since its a destroked H22, alot in common.