Yesterday, gasoline was $4.08 9/10. So I bought 2 gallons of milk and got a coupon good for $.10 off each gallon of gas.
The question was: Do I wait until Friday to fill up (after I've used a little more gas and buy more with the coupon? Or buy it on Thursday, knowing what the price was then?
Buy a little less now? Or risk the price going up?
So I filled up yesterday and today gas is $4.19.
I "won" $0.11 a gallon! Over a dollar! Okay...maybe not so much. But maybe it's the thrill of the chase.