This app queries the site www.gas-tankstellen.de.
You can update the price information. Account at www.gas-tankstellen.de needed. See menu "Info" in app.
If you want to provide a translation for the app, contact me.
If you want to support my work, I have also published some apps which you can buy.
If the installation process tells you that the package file is not signed correctly, deinstall the app and then reinstall it again. This should fix the problem.