NEW YORK (CNNMoney) – The national average of gas stands at $3.81 a gallon. Prices are up 24% from the start of the year. A big culprit behind the surge has been oil. While gas prices typically start to rise at this time of year, $100 oil isn't helping. Based on current oil prices, there … Continue reading Shell Oil president: 'We're going to need significant efficiency gains in energy usage'