I reckon it's so he can catch up with the tanker ! But not close too quickly otherwise he'll rim the basket .
Great photos though . . .
Carbon footprint . . . more bollocks. Global warming was supposed to presage another ice age (AND I've seen the cartoons - they got away ;o), the last four ice ages were obviously down to Stone Age man's over use of motor cars and fossil fuels etc . . .
So, big engines burning more carbon-based fuels - GO FOR IT, we'll be long dead before it matters (that should wind up the Greens).
Have fun all