The Mercedes GLA is based upon the Mercedes A-Class, and so you would assume that this small SUV would be pretty practical. However, whilst the GLA offers 481 litres of boot space and therefore, may out class rivals such as the Audi Q3 (470 litres), it struggles against the Range Rover Evoque (575 litres). So what do all these numbers actually mean? How much space does the GLA offer? Will passenge
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