Ok - I am about to be driving 15,000 miles a year - up from about 5,000. Currently using the MC FL - 820S. Was considering the Wix but I have read some things here that seem to indicate some Wix are better than others. I can get them at O'Reilly's so that is easy to do. I use PYB at present. Which filter would you choose for 80% highway/20% city driving.