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I've had my LS460 SWB abt 2 weeks. In mostly city driving I'm getting abt 16.5 MPG. That's abt the same as my old BMW 540. Given that the LS is larger, heavier & has a 4.6L (vs 4.4L) engine, I'm satisfied.
Yes, it's somewhat paradoxical to expect good fuel economy driving a five thousand pound car, but if we are pitiful victims of our materialistic wants, and we are hopelessly price conscious at the same time, every little bit helps.