Winglets descrease induced drag (drag from the production of lift) created by wing-tip vortices, simply turbulent airflow off the edge of the wing. So they do increase handling characteristics and fuel efficiency because of the increase in lift and decrease in drag. Hope this helped!
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An inclined plane does not decrease the amount of energy I need to put into raising a load. Similarly, it does not make my coffee, shine my shoes, wax my car, prepare my dinner, walk my dogs, or help me do my job.
ride in a plane. you would fly a plane