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Remember that a good portion of the weight is in the Big Block engine. They are around 500lbs heavier than the v-6. Fud lists the weights he found, and to be honest it pretty well jives with my somewhat rusty memory of the weights of these things.
My century also only had the 3 speed auto transmission. A well built 4-speed would do better on the highway. Once you get the mass of the vehicle going, it actually takes very little HP to keep it up.
It does not sound like you are planning to get rid of your metro either, so this would be a second car? If so, then even if it does not get the best MPG, so be it.
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