NASHVILLE — Tennessee motorists are finding the lowest prices at the gas pump since April. The state average price for a gallon of regular unleaded fell 5 cents last week to $2.56, 17 cents less than this year's high but 28 cents more than this time last year, AAA reported. The state average declined for the 24th consecutive day on Sunday for a total discount of 14 cents. “Tennesseans are saving 20 cents per gallon, compared to when gas prices peaked during Memorial Day weekend,” said Mark Jenkins, AAA spokesman, in a press release.