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Low speed single auger juicers, or twin gear juicers are best when it comes to juicing leafy vegetables. If you have the centrifugal style juicer (which are best for juicing harder fruits and vegetables) it is recommended that you ball up a handful or so of the spinach or lettuce etc and put it through your juicer with something harder such as a carrot or stalk of celery. Doing this will help the cutter blade better get a hold of the leafy vegetables and should produce a better yield for you.
If you are primarily juicing leafy vegetables it is recommended that you use a juicer such as the Omega 8003, or other low speed single auger juicers which were designed specifically to be able to juice wheatgrass and other leafy vegetables effectively while still being able to juice harder fruits and vegetables.