I bought a set of eibach springs and struts for my civic vx... no change in mileage over the course of almost two years, after that two years I replaced them with stock parts due to the eibach parts being wore out, leaking dampening fluid and wearing out the rest of my suspension, needless to say it was an expensive lesson.
It was also one of the roughest, harshest most uncomfortable things I've ever done to a car.
But I suppose, if you put lowering springs, a cold air intake, a header, 17" rims and who know what else on your car your mileage should double, right?
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