Deflecktors are cheap, lightweight covers fitted to lorry wheels, which improve fuel efficiency by reducing drag.

Fitted onto the eight wheels of a truck and its trailer, the Deflecktor cover – made of lightweight fabric – is calculated to cut fuel consumption by two per cent. It works by covering the wheel holes to reduce turbulence as lorries move at speed. Inventor Jon Fleck points out that on industrial-sized wheels, each of the holes is roughly the size of a car window.