Only components such as the battery and the tires are not recylable. -SmartUSA will plant a tree for every purchase of the Smart Fortwo model Smart car. -Smart cars have a maximum speed of 90 miles per hour, and a modified Smart car can accelerate from zero to 60 miles per hour in 4.5 seconds. -The Smart Fortwo model emits only 87 grams of CO2 emissions per kilometer.