1. Determine your vehicle's fuel efficiency. This information can usually be found in your vehicle's owner's manual or online. Fuel efficiency is typically measured in miles per gallon (mpg).
2. Calculate the total fuel needed. To do this, divide the total distance of the journey (in miles) by your vehicle's fuel efficiency (in mpg). For example, if your vehicle gets 30 mpg and you're traveling 135 miles, the calculation would be:
135 miles / 30 mpg = 4.5 gallons
3. Factor in the petrol price. Multiply the total fuel needed (in gallons) by the petrol price per gallon to find the total cost of petrol for the journey. For example, if petrol is $3.50 per gallon:
4.5 gallons × $3.50 / gallon = $15.75
Therefore, based on these assumptions, you would need approximately 4.5 gallons of petrol for a 135-mile journey, and the petrol cost would be $15.75.
Note:
1. The actual fuel consumption may vary depending on various factors such as traffic conditions, road conditions, vehicle load, driving behavior, and weather.
2. Some vehicles may have a fuel tank that can hold more or less than 4.5 gallons. Make sure to check your vehicle's fuel tank capacity to avoid running out of petrol during the journey.
