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Let the car warm up for a few minutes, than go. I know it sounds like "waste fuel to save fuel," but you'd be surprised what a difference on older cars it can make. (Not necc'l FE but definitely health of the car.)
Also, I'm not sure about Geo's, but do they have an insulated tube that takes heat from the exhaust to the intake to warm it up? Make sure that isn't disconnected.
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