I would encourage everyone to come out and experience lapping at GMP. The amount of tire and brake wear is controlled by the driver.
The track surface at Gimli is abrasive. It's old ash-fault, suffering from years of erosion, we are kinda lucky to have it our backyard. It's much the same surface as St Andrews airport. The duration that the tire is under load from cornering is greater at GMP compared to St Andrews, resulting in more heat, more wear.
Below are my thoughts on Lapping Days. Excessive wear on the road course occurs primary for two reasons...
1 - You're over driving the car. Most street cars tend to understeer at the limit, carry too much corner speed, primary on entry, you end up plowing your way through. You can feel the front sliding, scrubbing off speed and tire tread. Happens all day long during HPDE events. Corner 1 will destroy tires if you drive like this.
2 - You're actually driving at the limit, using 100% of the available grip, you've done 1000's of laps at GMP you know your car and track. The car is neutral through the corner, all four tires are sliding at their optimum slip angle. You're hitting all, your marks, primary concern is getting the best lap time. Brake, tire and vehicle wear are secondary.
Ninety percent of tire wear occurs in corner 1, the right front taking the most abuse as it sees the greatest load and overheats. Overheat a street tire and it will chunk. Every other corner you can be messy, with minimal tire wear, but not corner one. Don't dive bomb corner one, there's so much else you can work on. Slow it down and be smooth, lapping is not racing.
I'd suggest rather than trying to set the fastest lap time, concentrate on actually learning something. Lap days are NOT timed events, so slow it down and conserve your car, brakes too. Come out for lapping and learn some new skills, or improve the ones you already have. Learn the proper race line, it will take you at least a hundred laps. Keep your eyes up, you'll see things when your not it the tunnel of trying to go as fast as you can. Practice your brake release, learn to trail brake, get your heal-toe downshifts smooth, and much more. Concentrate on just one thing for a session or two, feel what the car is doing, what do you hear? There's so much you can learn, it will take more than day, perhaps a lifetime. It's all about having fun with your buddies.
The amount of wear & tear is completely up to you and your wallet size, so drive accordingly.