The green one is mine, and it will consistently return 60 US MPG, and driven sensibly but not carefully. Mine has wide wheels and tires, and is a convertible, so the top is often down (bad aero). When it's up, the heated seats or air conditioning are usually on.
www.spritmonitor.de reports that the average fuel economy of all first-generation diesel smarts is 57 US MPG, so I am slightly better than average.
The diesel smarts were sold in Canada between September 2004 and November 2007, being only 2005 and 2006 models.
The new smarts with the 1 L Mitsubishi engines are good for maybe 40 US MPG if driven similarly.
The black car is owned by Serge in Quebec and he has a lifetime fuel economy of 72 US MPG. I know of one other Canadian smart that is at that level of FE.
The 100 MPG statement, if issued by a US smart salesperson, is scandalously off-base! The diesel can achieve it on the highway at a steady 50 MPH, but not the gasser!
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2008 Mercedes-Benz B 200
2006 smart fortwo BRABUS Canada 1 cdi cabriolet
2005 smart fortwo cdi pulse cabriolet
1966 Peugeot 404 Coupe Injection