Fuel prices are still near $4 in some parts of the country, notably including California.

Here’s something U.S. motorists can celebrate: U.S. fuel prices have taken a sharp tumble over the past week, dipping below $3.50 a gallon on average across the country, just in time for the Independence Day holiday.

That’s not to say we won’t see many service stations jacking up prices to take advantage of holiday travelers, a 4^th of July tradition as familiar as hot dogs, apple pie and fireworks. But the latest weekly survey from the Energy Information Administration finds that a gallon of regular has tumbled to $3.496, down from $3.577 just a week ago.

The downward trend comes in line with earlier forecasts by the EIA that prices of crude oil and refined petroleum products would generally favor consumers in the months ahead. That reflects ongoing concerns about both the U.S. and Chinese economies, as well as weak demand in Europe.

For Midwest motorists, the news is particularly worth celebrating. The region saw gas spike due to problems with local refineries, prices for unleaded regular jumping to well over $4 in some areas over the last month, setting or nearing all-time records.  In Michigan, prices have plunged back to an average $3.409, according to tracking service GasBuddy.com, and in the Southeast community of Lambertville, at least one service station is charging just $2.99 a gallon.

Prices under $3.00 have become commonplace in some regions, in fact, including South Carolina, which GasBuddy reports as having the lowest average statewide price this week, at just $3.127 for unleaded regular.

The Gulf Coast, with its close access to the oil wells of the Gulf of Mexico, as well as numerous refineries, has the lowest average price of any region, at $3.312 a gallon, according to the EIA, down from $3.377 a week ago. Alabama, Mississippi and Louisiana are among the 10 individual states with the nation’s lowest fuel prices this week.

At the other extreme?  Drivers in car-crazed California can expect to pay $4.002, according to the EIA, though GasBuddy has the figure at a slightly lower $3.958. Either way, that’s the highest figure for the 48 mainland states.  The Energy Information Administration also reports the West Coast, in general, has the highest average price of any region, at $3.892.

Oil-rich Alaska tops the Golden State, however, at $3.987 a gallon, according to GasBuddy, which list Hawaii as the most expensive place in the country to fill up, at $4.237 for unleaded regular.

Prices can vary widely from town to town, and prices of as much as $5.09 a gallon have been reported in Los Angeles, according to GasBuddy.  In South Carolina, meanwhile, the service has spotted stations selling at a low of $2.89.

Various tracking services come up with slightly different averages, though the downward trend is clear this week. The AAA’s Daily Fuel Gauge Report on Tuesday found the nationwide figure to stand at $3.478, sliding yet another penny from the beginning of the week and down nearly 14 cents in a month.  But before you light the Roman Candle, the service shows that American motorists are still paying a fair bit more than a year ago, the national average for July 2, 2012 coming in at $3.326.