Then in June 1947 the purchase tax was doubled on cars costing more than £1,000, with home market sales already having been restricted to cars for "essential purposes".[115] Petrol remained rationed; initially ten gallons a month, the monthly ration was increased to fifteen gallons in July 1946,[116] but was reduced again late in the summer of 1947.[117] Princess Elizabeth took her 2+1⁄2-litre coupé,[118] a 21st -birthday gift from her father,[citation needed] to Malta, where her new husband was stationed.[118] The King took delivery of a new open tourer straight-eight in March 1949.[citation needed] In the commodities boom caused by the 1950 Korean War Australasian woolgrowers reported the new electrically operated limousine-division to be 'just the thing' if over-heated sheepdogs licked the back of a driver's ears.[citation needed] A DE 27 limousine given to HRH Princess Elizabeth by the Royal Air Force as a wedding present was traded for a Rolls-Royce when its transmission failed.[119]