Gas prices in Wisconsin continue to rise. According to Triple-A, the average price for a gallon of unleaded gas is $4.31 a gallon — nine cents higher than it was a week ago. Wisconsin’s average price is still lower than the national average of $4.59 a gallon. The lowest average gas price in Wisconsin can be found in Burnett and La Crosse counties, at $4.10 a gallon. The highest average price is in Kenosha County at $4.54 a gallon.