Route from Swansea to Eastleigh by car

The driving distance between Swansea and Eastleigh is 166 miles. Travel time is 2 hours and 56 minutes by car.

Fuel for the journey in the form of petrol costs 28.7 pounds. The gasoline price is assumed to be 143 pence per litre in the calculation above, and the vehicle's fuel consumption is miles per gallon.
The expense for two individuals participating in a carpool is £14.35 (equivalent to 28.7/2) per passenger.
The fare for this journey for three individuals in the vehicle is 9.57 pounds (28.7/3) per passenger.
7.18 pounds (28.7/4) per passenger is the expense of this journey for a car carrying four passengers.

(165.52 miles at mpg) x 143 pence per litre for fuel equals 28.7 pounds.

To be more precise, the outcome is as follows:

Fuel Required = Distance / Vehicle Fuel Consumption (in miles multiplied by 4.54609 per vehicle)20.1 litres are consumed (165.52 miles * 4.54609 / mpg).

Required fuel = 20.1 lt

Fuel expenses are calculated as follows: 20.1 litres x 143 pence per litre, or 28.7 pounds

28.7 pounds for fuel to get from Swansea to Eastleigh
 

Things that affect how much petrol costs when you drive a car are 

• Prices of Fuel: One of the main things that affects fuel costs is the price of fuel itself. Fuel prices can change because of changes in global oil costs, local taxes, and market demand.
• Route Choice: The path taken while driving can change how much petrol you use. If you want to save money and petrol, choose routes with lower speed limits, fewer stops, and less traffic jams than routes through crowded cities. 
• Maintenance: For the best petrol mileage, it's important to keep your car in good shape by doing things like changing the oil, rotating the tires, and tuning up the engine on a regular basis. Not doing upkeep can cause your car to use more petrol and cost you more money. 
• Fuel Efficiency: A big part of how much fuel a car costs is how efficiently it uses fuel. Cars that are more fuel efficient will use less petrol per mile or kilometer, which means that you will spend less on petrol. 
• Driving Habits: The way you drive, like speeding, accelerating quickly, and stopping a lot, can have a big effect on how much petrol you use. By driving more smoothly and keeping your speed steady, you can save money on petrol and use less of it. 
• Vehicle Weight: Adding extra weight to your car, like extra goods or roof racks that you don't need, can make it use more petrol. Getting rid of weight that isn't needed can make fuel use more efficient and cut down on fuel costs.

The trip with diesel fuel costs 18.1 £ (151p/lt, 62.7 mpg).
For 2 passengers: 9.05 £ (18.1/2) /p.
For 3 passengers: 6.03 £ (18.1/3) /p.
For 4 passengers: 4.53 £ (18.1/4) /p.

The second route from Swansea to the Eastleigh is 187.16 miles and takes 3 hours and 19 minutes.