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318 fuel consumption

  Ever since I bought my 85 318i, I have been getting bad gas milage, ~21 
mpg.   I understand that I should be getting around 30 mpg.  The weird 
thing is that the car runs perfect.  A week ago I put in new spark plugs 
and they are already showing carbon deposits.  According to the Bently 
manual, the 3 coolent switch/senders seem to be working fine.  The cold 
start valve & switch seem to be working fine. The fuel presure is around 
40 psi.  I think I have narowed it down to the air flow meter or the 
oxygen sensor or the %CO.  The resistance readings I get on the air flow 
meter are not anything near the readings the Bently manual gives.  The 
manual has been wrong in the past,  does anyone know if it is correct?  
Is there anything else I should check?  Is there any damage that the rich 
fuel mixture could have harmed; I have been getting ~21 mpg for close to 
2 years.  Any input is very much appricated! 

 Thanks