Reuters: Americans are paying slightly higher prices this Thanksgiving to warm their homes with heating oil than they did last year, the Energy Department said on Wednesday. The nationwide heating oil price of $2.75 a gallon was up 3.4 cents a gallon from a year ago and up 0.3 cent from the previous week, according to the Energy Information Administration’s weekly survey of U.S. heating fuel costs. EIA, the Energy Department’s analytical arm, said District of Columbia residents again …