I didn’t mean for it to become a game. It’s just that I couldn’t be bothered to stop for a bun and to refuel the Ford Fiesta ST

Instead, I carried on driving, and then carried on a bit longer, and a bit longer, and now I’m only 89 miles from Calais, in a stupid game of my own making that I didn’t want to play in the first place, wondering if I can drive from the Frankfurt motor show to the Channel tunnel without refuelling. 

The trip computer says I’ll run out of fuel in 109 miles, so at least I’m winning.

Except I’m not, am I? I’m driving behind a lorry – close enough to get some slipstream, but not so close that its driver is annoyed, and I’m doing maths. 

Sure, the trip computer says I have 20 miles in hand, but I’m a long way from winning. I’d filled the Fiesta – into which 
we usually squeeze around 45 litres of unleaded when the trip computer gets tetchy – on the way into Frankfurt, so I’m asking for a range of more than 450 miles. And that means, if I don’t fill up until I roll into a filling station in Folkestone, I have to better 45mpg. Under more normal circumstances, the Fiesta gives 38mpg.