LSAT Logical Reasoning Question of the Day

Roger: The only reason diesel cars are not commonly used in the United States is that people believe they are more costly to fuel and maintain than gasoline cars. Fueling diesel cars is less expensive than fueling gasoline cars because they get many more miles per gallon. Diesel cars also last many more years. While other countries transition to diesel, the United States follows a myth.

Tamara: Many people in the United states do not even know that purchasing a diesel car is an option. Others may choose to purchase a gasoline car because they overemphasize the purchase price difference.

Roger and Tamara most likely disagree about which of the following?