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Even going to a lightweight AGM battery should save close to that amount. Odyssey batteries makes a 15 lb AGM battery, but it costs about $150 new. The lithium batteries are another option... I don't have a link though.
There is almost always a cost to weight reduction (beyond just the price, which can be very high), and the sad truth is, unless your car is a performance car, there are usually few non-do-it-yourself options. Even in the realm of performance cars, true weight reduction typically is relegated only to dedicated track cars. I could "easily" reduce my car's weight by ~ 400-500 lbs, but I'm not ready to drop the > $10,000 to do so.
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