That depends a great deal on your gas mileage. If you get 30 mpg, you'll need 22 gallons. If you get 20 mpg, you'll need 33 gallons.
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If a car can go 150 miles on 5 gallons then it will travel 600 miles on 20 gallons of gas
22 gallons x 15 miles/gallon = 330 miles
300 miles
You need 699/30 = 23.3 gallons.
At 25 mpg, it will take 4.12 gallons.