Nissan's 'Murano Green' has impressive fuel and fug stats for a sports utility vehicle, and dealer Honest Motors rightly highlights its potential for cross-border runs. The petrol-driven, 2.5-litre crossover was shown in tests in Japan to sip 10 litres of gas over 100km (28.25mpg) and costs HK$1.18/km to run with fuel at HK$12.99 a litre, the dealer says, adding that the Murano Green (below) has also been certified in Japan as an ultra-low emission vehicle. Honest Motors also says that the crossover has earned a first-registration tax discount, having been dubbed an 'environmentally friendly petrol-driven private car' by the Hong Kong government. Bravo, Nissan. But the dealer did not say - until we asked - that the Murano Green's 170ps QR25DE block belches 'about 217' grams of CO2 per kilometre. That spew is impressive for a mid-sized SUV on flits into Guangdong, but smaller-engined cars could slurp less gas and fug less on drives around Hong Kong. According to What Car? the one-litre Peugeot 107 on average drinks 4.6l/100km (61.3mpg) and spews 109g/km of CO2; the similarly sized Smart ForTwo averages 4.9l/100km (57.7mpg) and spews 116g/km of CO2; the 1.3-litre Jimny averages 7.3l/100km (38.7mpg) and spews 174g/km of CO2 and the 1.4-litre Volkswagen Golf GT averages 7.1l/100km (39.8mpg) and spews 169g/km of CO2. Such stats suggest all these runabouts are more Hong Kong-friendly drives than the Murano Green. So maybe their local dealers might call them the 'Peugeot 107 Green', 'Smart ForTwo Green', Suzuki Jimny Green' and 'Volkswagen Golf GT Green'.