The title is confusing. It starts by saying “compare the 2023 model to the 2013 model” and then mentions that the mix of cars has changes (proportion of SUVs in the mix). I feel like the title should have been “The average car purchased in 2023 emits higher levels of carbon dioxide (CO₂) than the average car purchased in 2013.” Then you can explain “This is due to the large proportion of SUVs in the mix.”

There needs to be more proofreading and editing of articles before they are published online, as the title here is a direct quote from the article.