It needs to be broken in if it had no mileage on it when you bought it. All cars consume much more gas until the engine is broken in...500 miles is not enough. It should get better after 1000, and not reach its best mileage until about 3 to 4 thousand.... Even tho the dealer or booklet may tell you otherwise. You must drive it carefully at this time, slow and easy accelerations so the engine can get loosened up. The first few tanks of gas will always go faster on a brand new car. good luck.
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