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How about, is $330 worth it for 1.14 mpg increase, with EXTRA POWA?!
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It's worth it!
This past May, I installed an underdrive crankshaft pulley on my Mustang. More power to the rear wheels and about a 1 MPG gain for ~$310. It will pay for itself in fuel savings in around 80K miles. But "bragging rights" are immediate!