Final answer:
The total change in the gallons of gas in the car's tank is -0.26 gallon.
Step-by-step explanation:
To find the total change in the gallons of gas in the car's tank, we need to multiply the distance driven by the change in gas per mile.
Distance driven = 6.5 miles
Change in gas per mile = -0.04 gallon
Total change in gas = 6.5 miles * (-0.04 gallon/mile) = -0.26 gallon
Therefore, the total change in the gallons of gas in the car's tank is -0.26 gallon.