I’ll assume you mean a short write-up explaining what an "Index of MPG for teen drivers" might be. Here’s a concise draft you can use or edit:
A "good" MPG for used cars typically driven by teens is between 40–60 MPG High-Efficiency Options: While standard gas cars at Index Of Mpg Teens
NHTSA (2020). Teen Drivers. National Highway Traffic Safety Administration. I’ll assume you mean a short write-up explaining
However, when they drove through the flat plains of the Midwest, their gas mileage improved dramatically. Alex's Honda Civic jumped back up to 45 mpg, while Maddie's Ford F-150 improved to 30 mpg. Index Of Mpg Teens