To find the maximum distance the electric car can travel, we can use the formula for distance:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
Given that the speed of the car is 70 mph and it can run for 5.7 hours, we can plug those values into the formula:
\[ \text{Distance} = 70 , \text{mph} \times 5.7 , \text{hours} = 399 , \text{miles} \]
Therefore, the maximum distance the fully charged electric car can travel is 399 miles.