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2003 Buick LeSabre; lost gas mileage, and gently vibrates.
I've been driving this car for nearly a year. I replaced all the wheel hubs with new Moogs several months back, so I don't think that is associated with this problem.
I recently went from 28 mpg, to about 23. At the same time, I noticed that I often have a gentle vibration when accellerating. If you've ever driven over a worn brick road, that's what it feels like. And it's not consistent; I took my brother-in-law for a ride to get his take on it, and could hardly feel it at all. Vibration is in the seat and floor, not the steering wheel. It is more noticeable when hitting dips in the road.
Engine, transmission, suspension? What do you think?