I am in week 2 of owning a 63 plate petrol model. I'm also back driving after 16 years so learning again...I put 30 litres in on Tuesday and the gauge went to almost '1', since then I've driven 117 miles and the gauge is nearly at quarter mark, seems too low for me. The onboard computer says I still have 135 miles of fuel left, is it normal for the gauge to be so low? It's disconcerting! Thanks for any advice.