"You're not exercising to burn calories - you're exercising to improve your work capacity, which will increase the amount of fat you can burn by helping you build and maintain lean body mass. Results will be drivien by performance, so fuel your training."
Mike T. Nelson, Eat To Perform
Here are some great articles to help you improve your workouts.
Warning: Some of these contain language that is "strong" or "colorful".
Sorry. They're still good reads.