Totally shady. They send you to the most expensive gas stations in your area, so that the amount you "save" on each gallon still makes it cheaper for you to just shop around a little. Plus, when you submit your receipt as proof of a transaction, they require tons of info to be printed on the receipt. Info which many gas stations don't include. Sometimes they'll even say the info isn't there when it is. Save yourself some time, people. Don't bother with this app.