Crude oil prices fell under $83 Monday following elections in Greece that likely will preserve the country's international bailout program.
In New York, West Texas Intermediate crude oil for July delivery shed $1.08 to reach $82.98 per barrel. Natural gas added 4.6 cents to hit $2.513 per million British thermal units.
Home heating oil gave up 1.93 cents to $2.6272 per gallon.
Gasoline moved lower, giving up 2.74 cents to reach $2.6743 a gallon.
At the pump, the national average price of unleaded gasoline fell to $3.505 per gallon from Sunday's $3.509, AAA said.