CINCINNATI, OH (FOX19) - The nationwide average for a gallon of regular gasoline has risen by 34 cents since July 1st but some states, including the Tri-State, have seen much larger increases.
Prices are up more than 50 cents a gallon in Indiana, Vermont, Illinois, Ohio, Kentucky, Michigan and Wisconsin.
Analysts say gas prices are usually driven up by demand but this summer, the economy is the driving factor behind the jump at the pump - as the stock market rises, so do crude oil prices and gas prices.
Problems at refineries out west are also being blamed for higher gas prices.
The Lundberg Survey of Fuel Prices puts the average price for a gallon of regular at $3.69, about 8 cents higher than the same time last year.
Nationally, a gallon of mid-grade averages $3.84 and premium $3.96.
Tucson has the nation's lowest price at $3.18, while Chicago had the highest at $4.23.