Drivers are seeing the cheapest December gas prices in five years, with the national average hovering between $2.85 and $2.90 a gallon. The average price here in Connecticut remains a bit higher, coming in at $2.98 a gallon. Fairfield County averages $3.08 a gallon, and Litchfield County averages $2.96 according to AAA. Analysts point to growing oil supplies. Experts say prices are expected to stay low into 2026, though states like California continue to pay more.