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I'm a mechanic at a stealership, and at work today I was thinking about this post and just so happened to drive a customers 2009Town Car with 146,000 miles. With a 4.6l ford, small "square" v8 with fuel injection. These average between 23 and 27 on the display. This one said 26. So I take a short run ( I had to drive it to operating temp for a test anyways) and driving it easy, coasting uphills, and holding a constant, slight throttle position downhil speeding up to 65, averaged 31 over the 8 miles I drove it. With an automatic, have gotten new Mustang GT's with manuals pretty close to that number. Just sayin.....
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