* Demand falls 2.1 pct year over year

* Four week moving average demand down 0.7 pct

* Average price off 2 cents at $2.71

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NEW YORK(Reuters) - U.S weekly retail gasoline demand fell 0.3 percent last week, according to the SpendingPulse report released Tuesday by MasterCard Advisors.

U.S. gasoline demand averaged 8.978 million barrels per day, down from 9.006 million bpd the previous week, the SpendingPulse report said. Demand was down 2.1 percent from the same week last year.

Over the latest four weeks, gasoline consumption in the world's top oil consumer fell 0.7 percent from the same period in 2009.

(For a graphic showing the four week moving average, click here: http://link.reuters.com/dah62k )

Average U.S. retail gasoline prices fell 2 cents to $2.71 a gallon in the week to Sept. 24, according to MasterCard.

MasterCard Advisors estimates retail gasoline demand based on aggregate sales activity in the MasterCard payments system coupled with estimates for all other payment forms including cash and checks. MasterCard Advisors is a unit of MasterCard Inc . (Reporting by Edward McAllister; Graphic by Stephen Culp; Editing by Marguerita Choy)