Does sound as if it was used on something legitimate - some thing that spoofed an extra 10/20% may be an hour building wheeze.
That said - if it was one's own plane the "traditional" booking of "Parker Hours" seems the best option for a fraudster.
A meter that over records would only have value to a fraudster renting out his plane - but a factor of six - one may get a little suspicious if if took four hours from Lydd to Le Touquet
