No. I just try to make sure I get everything for the lowest price possible, if that means using a coupon...great. I've only got so much money....so it needs to stretch so I can have my needs AND my wants.
But for gas I do. I live in a one gas station small town (gas station is next door to me) so when I travel to town which is 3 or 4 days a week I grab gas there if cheaper (sometimes it is other times not) I compare my savings against the one in my hometown. So for example yesterday it was $3.49 I got it at $3.40 so I just track that I put in X amt of gallons & write the difference. I'm sipmly doing this to see what kind of savings I'm doing by doing this as it's a new thing for me to do the last couple months.