I don’t travel much but I’d recently pondered the idea of a road trip and wondered about the cost. In just a minute or two with the help of Apple Maps I had it figured out. But it occurred to me that this would be the perfect use case for a Shortcut so I put this together:
Trip Cost Estimate

It asks for you to choose from your Contacts for an address or to enter an address manually. Then it will ask for your car’s estimated MGP then the cost of gas per gallon. Siri will then read you the results and offer you the option to share the text with a link to the map in Apple Maps which can be shared to Apple Notes or any other text app with a Share Sheet extension.