Arfurs right hand man
Car: 1.8 Civic SE plus Auto 9th G
Join Date: 31st January 2008
Location: South London,Uk
Thanked 476 Times in 380 Posts
£10 fuel at 1.35 per litre gives you just over 7 ltrs. The warning light comes on when there is 7.5 litres in the tank so I'm pretty sure it comes down to how far you've gone with the light on and, as others have said, how the car has been driven in the previous miles to calculate the previous range figures.
There are days when my car registers as having a range of 9 miles and within a 3 mile journey its down to 0, yet this week, on monday my car stated 35 miles yet here we are on thursday, having done 4 lots of 6 miles and a journey of about 15 and the car is still showing a range of 7. I know full well, if I put a £10 in it will hardly make any difference to the range at all though.