MPG for a smart fortwo (coupe or cabriolet) varies depending on the model year and how you drive. All 450 imported and converted smart fortwos run on regular 87 octane petrol (gas) only -- in the U.S. No diesel version is available in the U.S. as of this writing nor can a diesel smart fortwo be imported for legal use on U.S. roadways.
'450' refers to the generation of fortwos model years 2000 through 2007. 2008 is the '451.' Miles per gallon for the 450 range from 40 to 55 depending on your terrain and driving style. Model years 2000 through 2007 come with the Mercedes-Benz (MB) engine. Model years 2005 and 2006 have a turbo-charged MB engine. The 2008 smart fortwo, introduced in the U.S. in 2008 through Penske Auto Group, requires premium petrol and is equipped with a non-turbo-charged Mitsubishi engine. The EPA rates its MPG around 35.
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