Many motorists are clogging their car's engine by not using gasoline with enough added detergents.That's the conclusion of a study released Thursday by the AAA auto club.Federal rules in place since 1996 require all gasoline to have some engine-cleaning ad...

The average cost for a gallon of gasoline in the U.S. during the July 4 holiday week will be $2.86, according to AAA. That's the highest it's been in four years during the Independence Day holiday, which will mean more...

The average U. S. price of regular-grade gasoline jumped 5 cents a gallon (3. 8 liters) over the past two weeks, to $2. 97. Industry analyst Trilby Lundberg of the Lundberg Survey says Sunday that gas prices have spiked 66...

CAMARILLO, Calif. (AP) -- The average price of regular-grade gasoline in the U.S. has remained relatively steady for the past three weeks with a national average of $3.01 per gallon.Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that...