Gas prices have increased in many parts of the United States during the past week, according to AAA Northeast. Rhode Island’s average price per gallon hit $3.29, increasing by a nickel, while Massachusetts increased by 2 cents, also landing at $3.29 per gallon. The national average reached $3.47 per gallon, climbing 7 cents. Despite cheaper oil and decreased fueling, there is some inflation in pricing due to the switch to summer blend gasoline, which may lead to an increase of 5 to 10 cents per gallon. However, if demand and oil costs remain low, this inflation may cease. The national average gas price is significantly lower than it was this time last year by 85 cents, and a decrease of 6 cents compared to last month.