29-03-20, 01:03 PM
“A tankful” isn’t a very precise measurement. The point where the warning light comes on is quite vague and so is the point where you decide when to stop filling. Measure in actual litres over several fill-ups and you’ll have a more accurate figure.
For what it’s worth, I average 56 mpg from my Boxeye (but I weigh 60kg and try to avoid getting pulled over by traffic cops).