Many local folks are frustrated that a gallon of unleaded lists for an average of around $4 this week in Hawaii, about 80 cents higher than a year ago.

But things could get worse.

The Hill reported Tuesday that the average price of a gallon of gas is expected to increase by between 10 and 20 cents nationwide by August.

According to the American Automobile Association strong demand and more expensive crude oil prices are pushing gas prices higher.

Hawaii is still some distance from its record high of $4.61 back in April 2012. But things are not cheap.

Honolulu prices currently average $3.96, Kahului averages $4.02, Hilo averages $4.07 and Lihue averages $4.24.

Nationally the average is $3.13. California has the most expensive gas at $4.30 while Virginia has the cheapest at $2.94.