I have one of these that I worked out from a few years ago.
did 549.2 miles on 63.35 litres
equivalent MPG is 39.41 miles per gallon, at the time costing an average of 12 pence per mile, mostly motorways, dual carriageways and A-roads and I was going fast
Best mpg I ever got (in the same car) was 55mpg over 220 miles, which was entirely motorway but less hills and I was taking it easy
