Gasoline prices are steadily increasing as the summer driving season approaches.
The national average for regular unleaded gasoline on Monday was $2.91 a gallon, more than 40 cents higher than the $2.50 a gallon average one month ago. Average prices at the pump rose 5 cents a gallon since Friday, April 21.
The average price one year ago was $2.22 a gallon, according to AAA of Hawthorne, Fla.
Last year the average price of gasoline peaked at close to $3 a gallon in early September, after Hurricane Katrina took a toll on refining capacity and production along the Gulf Coast.
Diesel fuel was selling for an average of $2.93 a gallon on Monday, up from $2.87 three days earlier.
AAA's Daily Fuel Gauge Report surveys prices from 85,000 self-serve stations and reports the data on www.fuelgaugereport.com.
Crude oil prices dropped from last week's record high of $75.17 per barrel to $74 a barrel on Monday morning.
The residents of Kahului, Hawaii, were shelling out the most to refuel their vehicles, paying $3.54 a gallon on Monday, according to GasPriceWatch.com. Meanwhile, people living in Jerome, Idaho, can find regular unleaded selling for $2.36 per gallon.
GasPriceWatch.com uses volunteer spotters, who have listed more than 382,000 prices this week.