The fuel cost is about INR 100/- per litre which varies slightly depending on the country, location (ones nearer the airport are costlier than others), etc. Most of the petrol stations are self service types – you park the car, fill up the tank and then go to the counter to make the payment.
Now, some other issues about driving. Honking is uncivilised, so it’s best avoided, except in emergencies. Similarly, it is illegal to flash/ beam headlight either frontally or from behind, onto another car. German rule considers flashing of headlight on other vehicle a coercive act. Driving on the right lane, keeping the left ones free for overtaking, is followed as a rule. After overtaking, the car promptly shifts rightwards. Overtaking from the wrong side, irrespective of how many empty lanes are there, is a strict no-no.
Overtaking – there are defined portions on the road, where this act can be performed. For starters, the continuous yellow/ white line dividing a two-way road is not be crossed over randomly.