tanker truck

Rocky Mountain Supply is dedicated to providing southwestern Montana with quality Cenex petroleum products. Our group of outstanding employees combined with the finest fleet of trucks in Montana means you’ll get the highest level of service every single time.

Refined Fuels

Rocky Mountain Supply has the fuel you need to keep your farm, fleet, or firm running at it best, and we have the people and equipment to get it to you when you need it. We deliver to farms, ranches, mines, fleet yards, job sites, and just about anywhere you need fuel. Our trucks range in capacity from 2,700 gallons to 12,000 gallons, so whether you need 200 gallons in your farm tank or a tanker load for your fleet, we can handle the job.

We offer Cenex® TOP TIER™ Detergent gasoline in all grades, with or without ethanol. With two-and-a-half times as much cleaning power as standard gasoline, it helps maintain your engine as it runs. Every fill-up is like a tune-up.

We also offer Cenex® Ruby Fieldmaster® for off-highway use and Cenex® Roadmaster XL® for on-road use. Cenex Premium diesel fuels were developed to meet the demands of new and existing engine technology, which means you’ll operate with higher efficiency and less down time.

  • fuel truck
  • Online Fuel Ordering

    Rocky Mountain Supply is pleased to offer you the option to order your fuel online. When you’ve submitted your form, a Rocky Mountain Supply representative will be in touch to finalize your upcoming order.

    Order Fuel>


We offer a wide range of products and services to help you buy the right product at the right time.

Would you like to reduce the risk and volatility of the prices you pay? We can help. Rocky Mountain Supply offers fixed forward contracts to help you manage your price and improve budgeting. Contact us to find out if fuel contracting is right for you. We would be happy to help.

Our keep-fill program is the best way to ensure you never run out of fuel. We have specific routes which we run the same time every month. By requesting to be on this program, not only do you never have to worry about your fuel levels, you save money by keeping the delivery system as efficient as possible.

We offer single-wall and double-walled tanks ranging from 500 to 12,000 gallons. Whether you want to upgrade your old tank or put in additional storage, we can help. We also carry pumps, meters, and all the accessories you need for your storage systems, and for those of you looking for vehicle tracking and cardlock systems, we have partners and resources to help you get set up right.


Montana Energy Alliance, LLC. (MEA) was formed July 1, 2001 as a joint venture between Rocky Mountain Supply, Inc. and Vigilante Electric Cooperative to market and distribute propane. All sales, distribution, and accounting of Rocky Mountain Supply’s former bulk propane will be handled by MEA.

Rocky Mountain Supply is fortunate to have an outstanding group of dedicated and knowledgeable professionals to service the producers of southwest Montana.

Contact Us

Call our energy department at (406) 388-6116
Email our energy department at petrooffice(at)rmsi(dot)coop