@sbikeboy Every Time I have tried a big purchase on the app, I have had my card frozen because it's suspicious, this then locks the Z app out because of a failed payment. It seems they try really hard to stop you from doing this when you see a good price.
@in_jesus_i_trust Depends where you buy the fuel though. There are some Z stations around the country that are significantly cheaper than others. They had a station for $1.99 pump price not that long ago.