The second one includes an individual fill up of 214.3 MPG. The first consists of 4 entries which don't show MPG (does this mean they were entered as partials or just that the individual MPGs were over 200? Not quite clear if invalid data like this - the 1.2 litres entries are clearly wrong - gets rejected or just causes the MPG calc not to appear).

The MPG calculation just doesn't appear if it's over 200 US MPG. You're seeing values over 200 for individual fills because you're viewing the site in UK units.

We don't reject individual fuel-ups—they all contribute to the overall average.

>seeing values over 200 for individual fills because

Aha, I see!

Thanks!