On a typical flight to TFS, in tanks, I'd say from experience, about 12,000kg, and 3-3.5% would be between 360-400kg which is about 10 minutes flying time if that depending on the weight of payload, it hardly makes a difference to an aircraft range, but as the cost of that 360-400kg of fuel rises, it will make a difference to the back pocket of jet2 for sure. Fuel, not range, to jet2 is quite obviously the critical issue at the moment, they seem incredibly concerned over the fuel efficency of its aircraft that Rolls Royce are being called in over engine washing facilities and overhaul.