My maths are as follows:
Based on £1.37 litre
37 miles of fuel used = 10.57% of a full tank 42l (350miles) =4.44 litres consumed = £6.07
£2.60 charging + £6.07 fuel = £8.67 journey cost
£8.67 converted to litres (8.67 /1.37) = 6.328l or 1.39 gallons
82 miles / 1.39 gallons = 58.99mpg
