A dual pull lever, if properly set up, or any front brake, for that matter, eases strain on the back tire when braking.
Front brakes are supposed to be 80% of your braking. Give or take.
You still haven't answered what brand of tire you're using.
Another factor is road surface. If you're riding off road or rough roads, that would make them wear down quicker, but I still can't see getting only one month out of a tire, unless you're skidding, powersliding, or doing burnouts.
Magrider wore out a set of schwalbe kojak slicks in one day, well, a little less than one day at the track racing in tucson, but even under race conditions and 20lbs of pressure, my race tires last a long time. I use kenda kiniptions or maxxis hookworms.