战斗机圈子里的人通常都不是一些省油的灯。

The fighter community in general is a tough audience .

例：三个儿子没有什么出息，两个女儿也不是省油的灯。

Ex. : None of the three sons show any good prospect, and neither of the two daughters are fair ladies.

佳佳妈在家里揣摩着这里边一定有问题，大可妈可不是省油的灯。

Allison mother at home here regardless of edge, certainly can mom wasn't fuel-efficient lamp.