Worked great the first few fill ups but, after that, it's like all the gas stations just stopped offering promo cash back. Now every gas station I come within range of is only offering 1¢/gal back. Also, promo codes do NOT stack! You'll hear all over the internet that you can stack them but, it hasn't worked any of the 50-60 times I've tried. Can't even get rid of my current code for a new one. Seems to lock you in on that one code. For reference, I live in California. This app sucks.