(Salt Lake City, UT) — As the summer driving season approaches, the price of a gallon of gas continues its steady climb. In Utah, the average price per gallon is four-dollars-99-cents, slightly higher than the national average of four-dollars-96 cents. Industry analysts say the price spike is caused by inventories growing smaller and refineries unable to keep up with the demand. They also say the price of diesel used for trucks has increased, too, which will add to the cost of food and clothing being shipped.