Gas prices dropped an average of 6.3 cents in Pennsylvania and 4.5 cents in Bucks and Montgomery counties from a week ago, according to AAA’s Fuel Gauge Report.

Nationally, the average price of self-serve gasoline is $3.810, down 4.9 cents from last week.

Historically, gas prices tend to fall from September through Christmas. AAA expects this trend, which has held true for seven of the previous nine years, to continue in 2012 and predicts that the national average price will continue to fall as we approach the end of the year.

For the last several months, rising global crude oil prices have contributed to high gas prices, but that trend has recently reversed.

If you spotted a good price on gas in the Warminster area, tell us in comments.