notice that there is a disclaimer in the app you've downloaded that the dev is not affiliated with fuelly.com. It's somebody who created an app that opens up m.fuelly.com .
Apparently shortcuts are too hard for the dev of the app.
My recommendation is to avoid that app and just use the browser to get to Fuelly. you can create a bookmark and make it a widget, so it's on your screen like an app would be.
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