How much would gas cost for a 685 mile drive?

To calculate the cost of gas for a 685-mile drive, we need to know the fuel efficiency of the vehicle and the current gas price. Let's assume the following:

- Fuel efficiency: 30 miles per gallon (mpg)

- Gas price: $3.50 per gallon

Using these variables, we can calculate the cost of gas as follows:

Cost of gas = (Driving distance / Fuel efficiency) * Gas price

Cost of gas = (685 miles / 30 mpg) * $3.50 per gallon

Cost of gas = (22.83 gallons) * $3.50 per gallon

Cost of gas = $79.91

Therefore, the cost of gas for a 685-mile drive with a fuel efficiency of 30 mpg and a gas price of $3.50 per gallon would be approximately $79.91.