<img title="2015 Chevrolet Silverado 2500/3500 HD CNG: First Look" src="http://blogs.cars.com/.a/6a00d83451b3c669e201a73d704ae2970d-800wi" border="0" alt="2015 Chevrolet Silverado 2500/3500 HD CNG: First Look" class="excerptimg"/>Chicago got the debut of Chevrolet's new bi-fuel (gasoline and CNG) Silverado Heavy-Duty pickups.
