1.146 CO₂ emissions in vehicles. Natural Resources Canada tests new vehicles each year and reports several variables related to fuel consumption for vehicles in different classes. ³⁸ For 2015, it provides data for 526 vehicles that use regular fuel. Two variables reported are carbon dioxide (CO₂) emissions and highway fuel consumption. CO₂ is measured in grams per kilometer (g/km), and highway fuel consumption measured in liters per 100 kilometers (L/km). Use graphical and numerical summaries to describe the distribution of CO₂ emissions for these vehicles. Be sure to justify your choice of summaries.