| In Canadian FE tests, the CVT loses the B 200 petrol 0.5 L/100 km on the highway and they're even in the city. So it's not a huge difference but it is 42.13 MPG versus 39.2 MPG for the CVT.
In my 200 km test loop, the CVT consistently drank 1 L/100 km more than the manual, according to the car's OBC.
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2008 Mercedes-Benz B 200 
2005 smart fortwo cdi pulse cabriolet, loaded 
1966 Peugeot 404 Coupé Injection
1989 Peugeot 405 DL, 366,000 km
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