TRENTON, N.J. (AP) — Gas prices continue to rise in New Jersey and across the nation to levels not seen since last fall.

AAA Mid-Atlantic says the average price of a gallon of regular gas in New Jersey was $2.57 Friday, up eight cents from a week ago — and above the $2.55 a gallon at this time a year ago.

The national average gas price Friday was $2.53 a gallon, up seven cents from last week and the same as the national average a year ago.

Analysts say a jump in prices in the spring is typical due to increased demand and the changeover to the more expensive summer blend gasoline in the coming weeks.