Frank,

Sorry, but I don't have a cure for your engine. I have similar economy gauge indications as yours ("84 380sl):
@ idle..all the way left
@ cruise..nearly full left (1/8 deflection or so)
@ slight accel (barely depressing the pedal)..at least halfway
@ normal accel from stop..nearly full right

The engine has a very noticable loss of power compared to previous performance. I hope someone will be able to point us in the right direction. Thanks in advance.

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Duke
'84 380SL