Yes, go to the 'My Glovebox' section of your app and tap on 'Journey Estimate', or click on the 'Journey Estimate' section of the web dashboard.
From there, type in where you'll be travelling to and from, and you'll see a an estimate of how much that journey will cost. Including petrol and diesel if you want.
Please note, the insurance cost is likely to change from the estimate if you take a different route.
Fuel costs are calculated using the average cost of petrol and diesel in the UK, but you can edit with your own MPG (miles per gallon) and cost per litre.
The actual cost of fuel for your journey may vary depending on the route you take, your driving style, road type and load weight among other things.