I filled my Peugeot 107 up to the brim with petrol yesterday to the drive a 160 mile journey taking 3.45 hours. Very pleased to see that only 1 bar on the gage had been used??? I had the air con on for the last 1.5 hours of the journey. How could I have used so little petrol? Can I trust my petrol gage? Could it be that the journey was on very flat terrain? I didn't do any heavy breaking or acceleration. I'm quite puzzled about it. Happy but puzzled.