To determine the amount of petrol needed, we can use the following formula:
Petrol Required = Distance / Fuel Efficiency
Substituting the values we have:
Petrol Required = 274 miles / 25 mpg
Petrol Required = 10.96 gallons
Therefore, approximately 10.96 gallons of petrol would be needed to travel 274 miles with a fuel efficiency of 25 mpg.