Deloitte's Oil & Gas practice Serves all of the top 10 oil and gas companies on the Fortune 1,000 Serves 97% of the Fortune 500 energy companies Provides tax services to 86% of the oil and gas companies on the Fortune 500 Provides auditing or enterprise risk services to 92% of the oil and gas companies on the Fortune 500 Provides consulting services to 64% of the oil and gas companies on the Fortune 500 Provides financial advisory services to 53% of the oil and gas companies on the Fortune 500