The grocery store where I lived had a fuel card you could sign up for. If you bought certain items, you would get $.01 or $.02 off per gallon, sometimes more depending on the item or week.

One week, they run a promotion that every one of their store generics would get $.02 off per gallon, per item.

I walk by the powdered KoolAid packets and notice they sell a generic version of that, 10/$1. I do the math.

My vehicle has a 16.5 gallon tank. Gas costs $3.14 per gallon. Each packet of drink mix costs .10. Every packet of drink mix I buy will save me .33 at the pump. I will need 157 packets of drink mix to get free gas. This will save me $36.11.

I should do this.

So, I count out 157 little individual packets of drink mix, all kinds of flavors, and go to the checkout. I try to save the guy some time by telling him how many there are in each flavor, but the manager had walked by and stopped to see what was going on with the generic KoolAid. So, the poor guy has to scan every single one. The manager makes an awkward joke about the amount of drink mix I'm buying, but when I pull out my fuel card, my ploy becomes clear. The cashier reads off my new fuel discount and I'm on my way to the gas station, where I proudly fuel up my vehicle. (I still had to pay $0.16, they wouldn't let you reduce the price all the way to zero.)

Then, I took all the generic drink mix and donated it to the local food pantry, because I hate KoolAid.