1. Preheat grill to medium-high heat.
2. Place oil, butter, and garlic in a small microwave-safe bowl. Microwave at HIGH for 30 seconds or until butter melts; set aside.
3. Coat corn with cooking spray. Arrange corn on grill rack; grill 10 minutes or until done and lightly browned, turning occasionally. Remove from grill; brush with butter mixture. Sprinkle with rind and salt.