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Weight reduction is most significant in city, stop and go, traffic. Accelerating the extra mass up to your speed is what takes the extra power. Driving on the highway at a steady speed means the higher weight just coasts along, using little extra power (the weight on the tires DOES increase their rolling resistance, but only a small amount compared to the inertia power use in velocity changing driving).
So, how much of your drive is stop and go, and how much is cruising? If you go red light to red light (like the paper delivery guy in another thread), weight will count a lot. If you cruise a lot, weight won't make much difference -- aero will.
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