Those of you with long-ish memories will recall my ultimately doomed attempt in February 2012 to travel 1000 miles in the UK on a single tank of diesel in a Seat Leon Ecomotive.

The final figure was 925 miles, mightily impressive but it still left me with unfinished business.

So today and tomorrow I'm attempting to finish that business in a new VW Golf BlueMotion, which with a combined economy figure of 88.3mpg, should be enough to beat the Leon and creep over the 1000-mile line.

But then, the Golf's fuel tank is five litres smaller than the 74.3mpg Leon's at 50 litres, effectively wiping out the the economy gain. But then it is lighter and has more power and torque, often benefits to achieving better real world economy.