My car has the ALDA turned up and a boost controller installed. Boost is up to 13.5 psi. It seems no matter how I drive I get 22mpg.
I have a different rear ratio than most of you though.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R