You haven`t told us how much more the new springs would cost. Lowering does improve mpg but I doubt it would pay for itself. If you go for it, I strongly recommend using progressive or soft springs, so that you do not ruin the already not not so smooth ride quality. It can never ever pay for itself if it ruins your back, even if the signs will show in the distant future, it`s just not worth it to risk sacrificing your health.
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