Depends on the fuel mileage of the vehicle in question.
At 20 mpg, it will take about 6 gallons of gas.
Depends on the car...
You will need to know the rate of fuel consumption to answer that question.
Find out the total number of miles you will travel. You need to know the number of miles you get per gallon of gas for your particular car. Then divide the miles per gallon into the total miles you will travel. That will tell you how many gallons of gas you will need. It will still be fairly approximate depending on how fast you travel and the conditions of the road.
11
About 20 gallons
Depends entirely on the fuel mileage of the vehicle you're driving.
8 miles per gallon To travel 420 miles you need 420/8 = 210/4 = 105/2 = 52.5 gallons and multiply this by the prevailing cost of gas per gallon and you will have your answer.
5.54
Who cares! Go to the gas station when you need gas.
None, if you are cycling.
25