1970: VW Super Bee bug mileage gas and air mixture

The idle mixture should be adjusted with an exhaust gas analyzer to ensure proper emissions. If we remember right, there are two adjustment screws close together. The big one being idle speed, the small one, idle mixture. To get it close, turn the idle mixture adjustment screw in (clock-wise) until the engine speed drops. Back out adjustment to obtain the highest idle speed. Turn in 1/8 turn. It should be very close.