I put my car as a standard because it's only a 1.4, but it's quite old and I like to rag it.
I wasn't horrified at all by the fuel costs; I put in my journey today to the out-of-town-shopping-thing and it only cost £1.11; the bus would be double that.
It's also useless when it comes to fuel type as well. Just by toggling between Petrol and Diesel (leaving the car type and price along), the cost goes up when selecting Diesel, which is bollocks!
From experience, my 1.9l Diesel VW Bora is noticeably more economical than the GF's 1.4l Petrol Skoda Fabia, despite being more powerful. The fact is that if leaving the price and car type alone, selecting "Diesel" should lower the cost, not increase it.
I think they may be doing a simple mileage x cost (so why mention fuel at all?)
cos I agree with you, my diesel costs more per litre than petrol but the car goes further
oh, and be aware, for international trips, the cost is shown in the currency the trip starts in - which may not be a problem unless your trip starts in an obscure country where you don't know the exchange rate (roumania)
I was trying to see if it would be clever enough to add the price of ferry crossings.etc (that would be an awesome feature). However, it didn't even tell me to board the Swanage ferry - just to drive into the sea :C