How many gallons of gas do you need for a 842 mile trip?

- For a vehicle that gets 20 miles per gallon, the trip will require 42.1 gallons of gas.

- For a vehicle that gets 30 miles per gallon, the trip will require 28.07 gallons of gas.

- For a vehicle that gets 40 miles per gallon, the trip will require 21.05 gallons of gas.