Given,
The number of miles covered by the car in one gallon is 15 miles.
The cost of one gallon of gas is $3.17.
The distance of vacation place place is 290 miles away.
The total distance has to cover in round trip is,
The quantity of gas required to cover 580 miles of distance.
The cost required for gas is ,
Hence, $122.57 (approximately) money will Thomas have to budget for the gas used on this round trip.