What type of vehicles have the most significant differences between the EPA mileage rating and actual mileage?

Vehicles with larger engines, such as SUVs, trucks, and performance cars, often exhibit the most significant discrepancies between EPA mileage ratings and actual mileage. These types of vehicles can be heavily influenced by factors like driving habits, load, and road conditions, leading to lower real-world fuel efficiency. Additionally, hybrid vehicles can sometimes fall short of their expected mileage in certain driving scenariOS, particularly in high-speed or aggressive driving conditions.