E36 M3 Convertible Tires / Mods

I've got a 1999 E36 M3 convertible. Grand car, great fun, but needs some tinkering. I've been running Pirelli PZeros, but burn through
them way, way too fast. I'm lucky I get 15,000 miles; 10k is closer to the mark.
So I'm looking for something else to shoe her with to get some more mileage. I'm not looking for 50-60 thousand mile tires necessarily, but I've got to do better than this.
Also, I'm not happy at all with the amount of body roll when cornering. The suspension is in good shape according to the shop, but the car still rolls a lot. Also has way too much understeer, IMHO.
I've read elsewhere that reducing understeer can be accomplished by adjusting the camber and that wider tires in the front can also help and have the added benefit of allowing one to rotate the tires, ideally gaining some tire mileage as well. Comments?
Thanks in advance for any suggestions, and for those of you in the USA, enjoy the holiday!
Bob Rancho Cucamonga, CA
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