Motorists gassing up Friday at several Hess stations and 7-Elevens in New Bedford got one of the lowest prices around: $3.19 a gallon. But at a Shell station in Waltham the cost is considerably higher: 80 cents a gallon more.
While there is normally a gap between the high and low gas prices, the spread right now is unusually wide, and is caused in part by the speed at which prices in the overall market are falling.

Comments
It's a no-brainer. You gas up where the cost is the least.