###Human: Dream's car consumes 4 gallons of gas per mile. If she drives 400 miles today and 200 more miles tomorrow than today, how many gallons of gas will the car consume?, ### Assistant: If she drives 400 miles today, the car will have consumed 4*400 = 1600 gallons of gas.
Tomorrow, if she drives 200 more miles, the total distance will be 200+400 = 600 miles.
The fuel consumption by the car tomorrow is 4*600 = 2400 gallons.
The car's total fuel consumption in the two days is 2400+1600 = 4000 gallons. 
 So the answer is :  4000