Title: E60 - 545i Spark Plugs review
Review: Car saw mpg improvement (roughly 1-2mpg for a total of about 15-30miles more on a tank of gas) as well as improved low-end acceleration (0-60 and definitely 30-70). Didn't see much difference in the top-end. As far as engine sound, vibration, etc I didn't see any difference although the car was fine to begin with so... Overall, great plugs and quality for the money!!
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