I'm very impressed with the Sunoco system. It washes the car very thoroughly and you control the speed for the initial undercarriage spray and the speed through the dryers..though you do have only 60 seconds to go through the dryers which is plenty, even driven slowly. Plus if you use the Sunoco rewards card when you fill up, every 4 or 5th fill up you'll have enough points for a free wash. 
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I also use Sunoco's car wash and I'm very happy using it. It's the only car wash near my home that's touchless without a conveyer belt.
