Can the app show me only locations that sell the type of fuel I need?

Yes. You can save preferences in the app by adding filter criteria in the Filters Screen. To access that screen, click on the “Filter” icon from either the Map View or List View screen, click on the “Fuels” menu, select your preferred type of fuel, then click “Apply Filters.” The mobile app will save that as a preference, as it only displays locations that sell that fuel in the future.