When automobiles are designed engineers try to maximize their fuel efficiency, even with modern technology. Today’s most efficient vehicles can only attain about 30% efficiency that means of all the chemical energy of the fuel put into an automobile only 30% of the fuel results in car motion which statement best explains why this happens, would it be much of the energy is destroyed most of the energy is transform into mass. Most of the energy becomes chemical energy much of the energy is transformed into heat.

Answer 1

The best statement that explains why modern automobiles typically achieve only about 30% fuel efficiency is: much of the energy is transformed into heat.

In internal combustion engines, a significant portion of the energy from fuel is lost as heat due to various factors—including friction, engine inefficiencies, and the heat rejected through exhaust gases. While some energy is used for useful mechanical work to propel the vehicle, a large amount is inevitably converted to heat rather than being utilized for motion.