Bi-fuel options, allowing either compressed natural gas or gasoline to power the 2015 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD pickups, will start at $9,500.

A dedicated CNG option on the 2015 Chevrolet Express and GMC Savana cargo and passenger short-wheelbase vans starts $10,825 for the three-tank system and $12,090 for the four-tank system.

The bi-fuel CNG option will be available on all 2015 Silverado and Sierra 2500HD and 3500HD single-rear-wheel models. The Express and Savana vans have fully dedicated CNG fuel systems—available in three- or four-tank models on cargo vans and exclusively with the three-tank design on passenger vans.

GM warrants and validates the fuel systems on all of its CNG trucks, vans and the upcoming bi-fuel Chevrolet Impala sedan through its five-year/100,000-mile—whichever comes first—powertrain limited warranty. All major components associated with the CNG system also carry GM service part numbers for availability throughout the largest dealer network in the United States.

CNG versions of the Silverado and Sierra 2500HD double cab and crew cab and the full-size Express and Savana vans are on sale now. The Silverado and Sierra 2500HD regular cab and all 3500HD pickups go on sale in July.