If your MAf sensor,plugs and alignment with wheel balanse is good,check oxygen sensor(when they not work properly - than double increase fuel consumption).
Also check exhaust manifold cover(under engine)-if it broken or cracked - immediatly need to change,cause it also reason for fuel consumption.
and if you want-i give you contact of very good and cheap service station (Russian) in Dubai, you will pay 250AED for full diagnostic and take consult from they.