Lower than expected fuel prices has sparked a boom in big car sales with 825,000 units sold this year compared with the previous highest figure of 807,000 units in 1998. Popular models include the Ford Falcon, Holden Commodore and Toyota Camry.

While rising fuel consumption is causing concern, fuel containing high levels of ethanol is also causing a great deal of consternation with a peak motoring body calling on the federal government to publish the results of random fuel testing so motorists can protect their cars.

NRMA Motoring and Services chief executive Rob Carter said the publication of results of random fuel sampling would enable motorists to avoid petrol stations selling high-ethanol fuel, which is said to cause engine damage.