Why are the Co2 levels in the Mini Cooper S and All 4 Countryman different?

I have just bought a new Mini Cooper S All 4 Countryman. Can you please explain why it is in a higher VED Tax bracket than the Mini Cooper S hatch which appears to have the same size engine, output and stop start facility? Also, it is only registering 31 mpg which seems quite low.

Asked on 21 October 2012 by GMF

Answered by Honest John
Higher CO2 because it's bigger and has four wheel drive. But should be doing better than 31mpg, unless all you use it for is short runs from cold.
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