I think clogged filters is more an issue of how dirty the fuel system is if you're only dealing with B20. I tried B20 on my 02 at 155,000 miles and was down to under a quarter of a tank when I filled up. I checked my filter once a week, but never had an issue. I was so impressed I tried it on my tractor and it blew all sorts of crap out of the exhaust the first tank, and stopped the black smoke, but didn't clog the filters in that either.