The 4.8is is a totally different beast. Did you get adjustable ride height on your 4.4i? The 4.8is having the 4 wheel air suspension doesn't ride as stiff as you would think, and with a set of michelin latitude tour HPs, it rides even nicer. If you can find one with some warranty left, that would be a plus. The steering would be lighter than the 4.4 at low speeds, unless you ordered servotronic with your car. I can average around 22mpg on the highway in my 4.8, and 15 around town (10~12 if I start stomping on it)

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