Fantastic service! I brought my car in to replace the brakes and get a tune up. I was told I didn't need to replace for another 10k. They also told me that I had superior spark plugs and that it would be $40 more than to use the standard spark plugs. I agreed, and now my car is getting 37 to 38 miles to the gallons! A 22% improvement. The car also runs much better. :)