Rear pads disappear more rapidly for me too, at a rate of about 2 rears to 1 front.

At the rear I replaced the OE ones (which lasted 9K miles) with EBC pads, cheap at �15, but didn't last as long as OE (about 6K miles) and were a little bit "grabby". The set I'm on now are Brembo (front and rear), which I think are the same as OE and have done 6K miles with about a third of the friction surface left on the back and more than half on the front. The Brembos were exactly twice the price of the EBCs, but a lot less than Yamaha genuine parts.

The EBC pads I got from EBC Direct and the Brembos from Bike Torque Racing

These are the ones I have tried on the Z...

Front EBC FA181TT
Rear EBC FA208TT
Front Brembo 07BB04-12
Rear Brembo 07BB02-40

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