(Chicago, IL) Gas prices have jumped significantly for the 5th straight week on both sides of the state line. AAA says the average gallon of gas in Illinois costs $4.97, which is 18-cents higher than last week and 39 cents above the national average. Lake County has jumped the 5-dollar mark, increasing to $5.07 on average. In Wisconsin, a gallon of gas now stands at an average of $4.32, which is 13-cents higher than last week, but 26-cents below the national average. Kenosha County remains significantly higher than the Wisconsin average at $4.56. The gap between the Illinois and Wisconsin averages now stands at 65-cents, and the gap between Lake and Kenosha County stands at 51-cents.