Hard to answer without more details but I'd say it's high for an MPS6 if you're driving "normally" (i.e not in city traffic and flogging it hard all the time), especially if you had lower figures before. If it doesn't settle down to your previous experience in 100-200kms then you might have overlooked something in your reassembly, such as under-tightened hose-clamps, leaky MAF sensor gasket, etc. Make the MAF is installed so the air-flow is in the right direction. It's pretty hard to get that wrong as the lead length makes it pretty obvious which way it needs to go, but it can happen.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18