You need to know the price per gallon.
4000 miles/21 mpg =190 gallons
cost = 191 x price per gallon.
If gas is $4.00 per gallon, that is 191 x 4 = $760
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4000 km = 2485.5 miles
You would use 7.96 gallons, so that would cost 19.91 to drive.
It would cost (2.4) times (the cost of one gallon petrol). Also, add cost of tolls, food, etc.
That depends on your fuel mileage.
$26.60