General Brazilian
perder impulso; perder força
most commonly used in both formal and informal contexts
São Paulo
perder momentum; perder gás
momentum often used in business contexts; 'perder gás' is colloquial
Rio de Janeiro
perder força; perder o gás
colloquial usage more common in casual speech
Portugal
perder impulso; perder força de arrasto
similar to Brazilian usage; more formal in business writing