Let's get to the WLTP-rated figures, which see both the GLA 180 and the GLA 200 returning 151g/km of CO2 and respective combined cycle fuel figures of 41.8 and 42.8mpg. Amongst direct rivals, these readings are good enough only to shade the rival Volvo XC40 T3 auto - and that's only because that Swedish contender is nearly 100kgs heavier. If you want to do better with a conventional powerplant, this GLA's much improved OM654 2.0-litre diesel unit beckons, capable of up to 53.3mpg on the combined cycle and up to 140g/km of CO2 in 150hp front-driven form; and 49.6mpg and up to 148g/km in 190hp 4MATIC AWD guise.
If you want to do better, you'll need the GLA 250e plug-in hybrid petrol model, which can put out WLTP-rated CO2 emissions of just 32g/km, record an official 2018.8mpg combined cycle fuel figure and can be charged from a 7.4kW wallbox in just 1 hour and 45 minutes.
We'll also brief you on the performance figures achieved by the more performance-oriented 2.0-litre petrol GLA models. The 224hp GLA 250 manages up to 36.7mpg on the combined cycle and up to 172g/km. For the 306hp Mercedes-AMG 35 4MATIC, it's up to 34.0mpg and up to 189g/km; and for the top, wild, 421hp Mercedes-AMG 45 S 4MATIC+, it's up to 29.7mpg and up to 215g/km.
What else? Well, residuals will be strong, providing you don't go mad on the options list. As you'd expect, the Mercedes after-care package is comprehensive, with a three-year unlimited mileage warranty that's notably better than the restricted three year / 60,000 deal that rivals Audi offer. Most owners will also want to take advantage of a 'Service Care' option that spreads the cost of routine servicing, guaranteeing the price of parts and labour for up to four services and covering the cost of all recommended service items such as brake fluid, spark plugs, air filters, fuel filters and screen wash. As mentioned elsewhere in this film, the 'Mercedes me' connect services package comes with a self-diagnostic feature, enabling it to monitor wear and tear items and alert your local dealer to let you know if something needs seeing to.