I have a 99 with a ton of the mileage from off road use, towing and towing offroad. (36 months and 26K miles now) My filter minder never moved. Just this month I did my fuel filter , the last of the filters in my Genos' kit, except for the air filter. since I'll be ordering another Geno's kit I figured I might as well change the airfilter.
When I took it out, the Green foam prefilter was black as if it was made that way and the dust was starting to seal off the pleats on the side of the pleated filter. And the green prefilter was starting to seperate from the pleated filter. So I figure what the heck. Out with the old and in with the new. I didnt like the fact that the prefilter was starting to seperate.
So I would suggest to check the condition of your filter besides watching the airminder. The airminder is great for towing..... if the filter becomes too restrictive before you think it's time to change it... at the moment the engine tried to suck a bunch of air but came up against a restrictive filter... the airminder "logs" the event.
JMHO.
Bob