thanks for sharing such a valuable information with us. it will really help me plan my trip and i will also take care of the petrol. but how do i know that the petrol is fine or not :s are there are trusted petrols on the highways who sell petrol only.
i think the average on petrol was higher may be because of the tuning of the car. is your car auto or manual?
and 100km/h speed is a very good speed. its a speed in which you are totally under control of your car 