TRENTON, N.J. - Gas prices dipped in New Jersey and around the nation as gas inventories increased even as crude oil inventories decreased.AAA Mid-Atlantic says the average price of a gallon of regular gas in New Jersey on Friday was $2.90, down two cents from a week ago.Drivers were paying an average of $2.11 a gallon a year ago at this time.The national average price for a gallon of regular gasoline was $2.86, down a penny from last week.Drivers were paying an average of $1.89 a gallon a year ago at this time.___AdvertisementDOWNLOAD: FOX 29 NEWS APPSUBSCRIBE: Good Day Digest Newsletter | FOX 29 Philly on YouTubeFOLLOW: Facebook | Instagram | Twitter.