Why are gas prices falling? National average below $4 a gallon for first time since March: GasBuddy
Filling up at the gasoline pump may still be a painful pocketbook experience, but the hurt appears to be fading day by day, with the U.S. national average price sliding below $4 a gallon Tuesday for the first time since March, according to one tracking service. The average price fell to $3.99 on Tuesday, according …