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Ultra is supercharged. the supercharged edition has more 'umph' when you punch it but it costs more and is is very expensive to service these units. Also, they should use premium fuel. My Mom has a n Ultra and I have a regular one. They feel the same to me when driving normally and I like the gas mileage mine gets (35 on the highway when driving less than 60 MPH).

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15y ago
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Q: What is the difference between a Buick park avenue and a park avenue ultra?
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