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You got to remember at end of the day its a big engine and on the motorway you are using momentum to keep you going thus using less fuel. Whereas about town you are stopping and starting and you require a lot of energy to move off again hence use more fuel
Im not very good with physics but hope above very loosely explains why mpg drops in town
Just double check your red boost pipe for any oil and and tray below for anysigns of oil. When my red pipe was leaking oil my mpg dropped to 24mpg around town...
dont take it the wrong way but around town are you booting it everywhere, pedal to the metal style?
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