I'd only just picked her up, brand new! it was around the first 100 miles, kept under 3000rpm and cruised on the dual carriageways and A roads at around 50-60mph. Never taken over 60! It looked like I was going to get over 42mpg on average, but eventually settled for a knat's earlobe under 40mpg
I've
never managed it since, strangely enough!
Tigger.