1. Determine your car’s fuel efficiency: Find out your car’s miles per gallon (MPG) rating, which can usually be found in the owner’s manual or by searching online. Keep in mind that there are two different ratings: city driving and highway driving. Choose the one that’s more relevant to your situation.

2. Calculate the distance between your origin and destination: Use a map or GPS device to determine the total number of miles you’ll be driving. Be sure to account for any detours or side trips along the way.

3. Divide the total distance by your car’s MPG rating: This will give you an estimate of how many gallons of fuel you’ll need for your trip. For example, if you’re traveling 300 miles and your car has an MPG rating of 25, then you would need 12 gallons of gas (300 ÷ 25 = 12).

4. Find the current price of gas: Check websites or apps that provide real-time gas prices for your area or at specific gas stations along your route.

5. Multiply the number of gallons needed by the current price of gas: This final calculation will give you an estimate of how much money you’ll spend on gasoline. In our example above, if gas is priced at $3.00 per gallon, it would cost approximately $36 for your trip (12 x $3.00 = $36).

Remember that these calculations are only estimates; factors such as traffic conditions, varying gas prices along your route, and changes in fuel efficiency due to vehicle maintenance can all impact your actual fuel expenses. To ensure accuracy, keep track of your fuel receipts and compare them with your estimates after completing your trip. This will give you a better understanding of your vehicle’s fuel costs and help you better budget for future trips.