Gasoline is selling at the lowest price since March amid rising gasoline supplies and falling oil prices. The national average price for a gallon of regular unleaded gasoline is on a 30-day streak of declines. Prices in Tennessee have fallen for 32 consecutive days according to Mark Jenkins, spokesman for the AAA Auto Club Group. “Oil prices briefly rose following the crash of Malaysian Airliner Flight MH17, but gas prices didn’t skip a beat last week,” said Jenkins. “Motorists continue to enjoy discounts at the pump and that’s likely to continue this week.” Oil is trading lower as gasoline supplies reach a four-month high. The Tennessee average price for a gallon of gasoline is 5 cents cheaper than last week at $3.29 a gallon. The average price of gas one year ago was $3.42 per gallon. Locally, the cheapest price found in Coffee County was $3.20 per gallon in Tullahoma, while the lowest price reported earlier this week in Manchester was $3.21 per gallon.