Gas prices set to drop below $4 a gallon

(CNN)– Gas prices are heading downward.

The average price for a gallon of gas is $4.01.

In South Carolina, the average price is $3.50 a gallon.

The dip is being driven by reduced demand from the end of the Summer driving season and the return to standard time.

People drive less when it’s dark outside, and sunsets will continue getting earlier until December 21.

Demand for diesel isn’t impacted the same way, which is why you aren’t seeing those prices drop nearly as fast.