Top 13 most Fuel-Efficient Cars

Smart for Two Convertible

3 cylinder, 1 liter, Automatic(S5), Premium
MPG City: 33 MPG Highway: 41
Estimated Annual Fuel Cost: $1,555





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http://www.forbes.com/2008/05/02/efficient-gas-cars-forbeslife-cx_ae_0502fuelefficient.html

Forbes Explores the Aluminum Advantage in Automotive Applications

By using aluminum in lieu of heavy steel--the traditional metal used to build a
car's body--manufacturers can reduce a vehicle's weight by as much as 45%, says
Zaluzec.

A recent Forbes article looks at aluminum's use in automotive applications and notes that by utilizing aluminum instead of steel a vehicle's weight can be significantly reduced. Low weight vehicles burn less fuel and produce fewer tailpipe emissions-both great environmental advantages. The article also highlights the importance of a multi-material solution, saying collectively aluminum and other low weight materials can help vehicles achieve an additional 20-30 miles per gallon.