The lady that sits across from me just got some whiz-bang gizmo to 'stabilze' the gas in her tank and 'improve fuel economy'

It's some metal disks in some configuration and you drop it into the tank. I've seen debunking of this cash-transfer devices before, but I can't remember what these things were called. It's 8:00am, and I feel like breaking her poor little heart.
That, and she got a K&N filter because she's planning on doing some dusty off-roading...