General Motors revealed bi-fuel option pricing for its heavy-duty pickups as well as dedicated natural gas fueling packages for its cargo vans this week.

The 2015 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD pickups, respectively, will start at $9,500 for a bi-fuel option allowing those vehicles to operate on both compressed natural gas (CNG) and gasoline.

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

The bi-fuel CNG option will be available on all 2015 Silverado and Sierra 2500HD and 3500HD single-rear-wheel models, GM said, with the OEM providing coverage for 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.

The automaker added that CNG versions of the Chevy Silverado and GMC Sierra 2500HD double cab and crew cab and the full-size Express and Savana vans are on sale no, with the Silverado and Sierra 2500HD regular cab and all 3500HD pickups due to go on sale in July.