69mpg from a 1.2 K12!?

Hi all, just bought one of these last week and I’ve reset the trip computer before going on a motorway trip. Over 100 miles doing between 55-60mph, it recorded 69mpg, way over the official numbers. That seems a wee bit unbelievable for a 2008 car with 112,000 miles.

Is my trip computer talking rubbish?
Add a benzine additive to the petrol and you car will run more efficiently and give you added MPG, and also offset the E10 petrol (90% petrol +10% ethanol ), which can be a problem for some motors.:unsure: