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The study by the British consultancy AEA looked at the labelling systems in operation in eight member states, and found some compare a car with the whole car market while others show only how it compares with others of the same type. It says comparisons against the whole of the available car fleet are likely to be more useful in the absence of further research. Another report in 2010 also recommended a harmonised approach to labelling. The Commission is due to review the 1999 directive on CO2 labelling next year.