I reckon c 9 - 10 l is not reachable in Belle's tank. I also get the same 365 miles to go at really full but the reality is the 50 miles to empty light comes on after a rapid fall especially from c100 miles to go. At the 50 mile to go point after c 200- 240 miles I can get in typically 35-37 litres. So at at 30 mpg there is left 18 l or c 4 gallons or 120 miles. So it matches.
The 240 mile range only being on long trip say up the A1 to Morpeth, 200 is more the norm.
