The national average retail price of regular gasoline rose 7.4 cents to $3.293 a gallon in the week ended Monday, the Energy Information Administration said. The rise was the biggest since the week ended July 15 and put prices at the highest level since Oct. 28. Signs of rising demand and tightening inventories boosted prices for a second straight week. Retail gasoline has gained 9.9 cents in the last two weeks after a 16.6-cent loss over the prior three weeks that left prices at the lowest level since Feb. 21, 2011. Prices are 14.4 cents, or 4.2%, less than the year-earlier level. The price of reformulated gasoline blendstock futures on the New York Mercantile Exchange last week gained more than 4%, or 10.4 cents a gallon, to the highest level since Sept. 13. The EIA last week said nationwide gasoline inventories in the week ended […]