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Sorry, I know this info is out there but I couldn't find it through the search function.
two questions:
1. What's the website that you get the 6637's cheap. I ordered two a while ago I just can't find the name.
2. How many miles do you put on a filter before changing it? I just checked mine with the flashlight after my last two tanks had significantly less mpg. No light came through so obviously I waited too long.