Ever since the filter was installed, and according to my UOA report, the silicon number keeps getting lower. It sounds like some of you would recommend changing the filter regardless of what the Filter Minder is indicating? STONR, you have 42K on your Wix filter. I've got 34K on mine. My truck is pretty similar to yours in that I drive on the highway 99% of the time. I suppose the filters are cheap, so why am I debating this. 
DATE: 4/3/2010
UNIT MILEAGE: 66,174 miles
LUBE MILEAGE: 9,639 miles
SILICON: 11
Installed Wix Filter
Date: 10/7/2011
UNIT MILEAGE: 76,442 miles
LUBE MILEAGE: 10,268 miles
SILICON: 10
Date: 7/9/2012
UNIT MILEAGE: 86,937 miles
LUBE MILEAGE: 10,495 miles
SILICON: 8
Date: 6/24/2013
UNIT MILEAGE: 96,669 miles
LUBE MILEAGE: 9,732 miles
SILICON: 5
Date: 6/19/2014
UNIT MILEAGE: 106,372 miles
LUBE MILEAGE: 9,703 miles
SILICON: 6
DATE: 4/3/2010
UNIT MILEAGE: 66,174 miles
LUBE MILEAGE: 9,639 miles
SILICON: 11
Installed Wix Filter
Date: 10/7/2011
UNIT MILEAGE: 76,442 miles
LUBE MILEAGE: 10,268 miles
SILICON: 10
Date: 7/9/2012
UNIT MILEAGE: 86,937 miles
LUBE MILEAGE: 10,495 miles
SILICON: 8
Date: 6/24/2013
UNIT MILEAGE: 96,669 miles
LUBE MILEAGE: 9,732 miles
SILICON: 5
Date: 6/19/2014
UNIT MILEAGE: 106,372 miles
LUBE MILEAGE: 9,703 miles
SILICON: 6
