Answer: runningonempty

AnswerCrossword Clue
RUNNINGONEMPTYAlmost out of gas
RUNNINGONEMPTYBushed
RUNNINGONEMPTYOut of gas
RUNNINGONEMPTYAbout to collapse, say
RUNNINGONEMPTYAlmost out of energy