The average mpg usage for a 2017 Toyota Prius for a sample of 10 tanks of gas was 45.5 with a standard deviation of 1.8. For a 2017 Ford Fusion, the average mpg usage for a sample of 10 tanks of gas was 42.0 with a standard deviation of 2.3. Assuming equal variances, at = .01, is the true mean mpg lower for the Ford Fusion?

Calculate the t_calc. (Round your answer to 4 decimal places.)