Gas needed = Distance / Fuel efficiency
Given that the distance from Dallas to Los Angeles is approximately 1,435 miles, we can calculate the gas needed as:
Gas needed = 1,435 miles / 9mpg ≈ 160 gallons
Therefore, approximately 160 gallons of gas are required to drive from Dallas, Texas to Los Angeles, California at 9mpg.
It's important to note that this calculation is an approximation and may vary depending on factors such as traffic conditions, weather, and the specific route taken.