General Brazilian
carona gratuita / carona de graça
Most common usage for literal transportation
General Brazilian
vantagem sem esforço / vantagem indevida
Used for figurative meaning of unearned advantage
Portugal
boleia gratuita / boleia de graça
Portuguese uses 'boleia' instead of 'carona' for ride/lift
General
aproveitar-se / viver às custas de alguém
Used when describing someone taking a free ride at others' expense