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Thread is old, but i'll post anyway.
Weight loss=good for city/stop and go traffic
Aeromods=good for highway
Combo of both is better. If you want to go without a spare, do it. I don't have a spare in my Geo and will probably never have one on short trips. If I go on a trip that is more than 30 miles from home i'll put a spare in. If you feel that you need a spare, keep it and try to lose 20 pounds elsewhere in the car.
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