<h3>Answer:</h3><h2>1. (A) 2%</h2>
Fuel efficiency is a form of thermal efficiency, indicating the ratio from the energy to result of a process that changes chemical potential energy held in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may change per device, which in turn may modify per application fuel efficiency.
<h2>2. (A) Carbon dioxide </h2>
Carbon dioxide is a colorless gas with a density of about 60% greater than that of dry air. Carbon dioxide carries a carbon atom contently double bonded to two oxygen atoms. It happens spontaneously in Earth's atmosphere as a trace gas.
<h2>3. (A) Fuel mileage and longevity </h2>
Car longevity is of concern to many car purchasers and interests different things: maximum service life in either mileage or time (duration), the connection of parts to this lifespan, classification of factors that might provide control in prolonging the lifespan.
