OK, when I first picked up the Jazz it came with a full tank. The 'range' indicator on the display reckoned there was 525 miles of fuel in the tank. As the tank and fuel level drops, so does the 'bar' and 'range' indication.. but each time I filled the tank up, the 'range' displays near as dammit 520 miles available again. However, this week after dropping 2 'bars' I decided to fill up. After driving off, the 'bars' didn't immediately go up and the 'range' stayed at 420. The 'bars' did go to max after about a mile, but the 'range' remained at the level pre fill up. It has steadily dropped ever since. I know it was filled to the max level, and I actually did a trip 'reset' too. I am just waiting now for the next time I fill up, to see if it makes a difference.