American Power Group to Participate at 2015 ACT Expo

LYNNFIELD, MA--(Marketwired - May 4, 2015) - American Power Group Corporation (OTCQB: APGI) announced that its subsidiary, American Power Group, Inc. ("APG"), will be an exhibitor at the 2015 Alternative Clean Transportation (ACT) Expo, North America's largest clean fleet show representing all weight classes and alternative fuels. ACT Expo 2015 will gather more than 3,500 participants at the Kay Bailey Hutchinson Convention Center May 4-7, 2015. Lyle Jensen, APG's Chief Executive Officer, will speak at the Innovations in Gaseous Fuel Systems & Vehicle Technologies Breakout Session on Wednesday, May 6, 2015 on new vehicular markets for Dual Fuel engines and technologies. APG will be displaying Harrison Truck Centers' 2015 Freightliner 122SD Severe-Duty APG Dual Fuel Glider™. The APG Dual Fuel Glider™ was named a 2014 Top 20 Product by Heavy Duty Trucking Magazine.

Lyle Jensen, American Power Group's Chief Executive Officer, commented, "The 2015 ACT Expo provides a tremendous opportunity and platform to educate prospective fleets on the economic and environmental benefits of using APG's dual fuel solutions as an effective alternative to 100% diesel without any loss of power or torque. Our dual fuel design is gaining in global popularity for high-horsepower applications in the trucking, marine, mining and rail industries, especially in applications where there is no viable 100% natural gas engine option available. APG leads the industry with 474 OUL and IUL approvals (2012-1987) covering six of the top OEM engine platforms including 18 IUL approvals received over the past 120 days for 2012-2010 OEM engine families (Detroit Diesel DD15/DD13 and Mack/Volvo D13) with SCR engine technology. For first time in the history of natural gas engines, APG now has a dual fuel solution for a first generation fleet owner looking for a natural gas solution and who rotates their trucks every four to five years."

Mr. Jensen added, "In February, 2015, Harrison Truck Centers, a large regional Freightliner/Western Star dealer, began offering factory installed APG dual fuel systems in their new 2015/2016 engine cabs for dual fuel gliders. In March, 2015, they launched their first factory installed Severe-Duty dual fuel glider. APG currently has Severe-Duty dual fuel glider trucks operating in the oil and gas fields of Bakkens, in the coal mines of West Virginia and in the logging industry in Louisiana. Gliders have lower operating costs as compared to a new diesel engine or new dedicated natural gas engine and are lighter in overall weight which allows an operator to transport more revenue generating product."

Mr. Jensen continued, "We will also spotlight our new 'Fueled By Flare™' dual fuel natural gas system at the conference. A convergence of technologies now allows wellhead/flared gas in the oil and gas fields to be filtered and conditioned so that it may be used as a safe and inexpensive alternative fuel source. We see a significant addressable market measured in the thousands of heavy-duty trucks supporting the oil and gas exploration industry. The ability to use conditioned wellhead/flared gas to fuel these trucks can provide an operator with net fuel savings of 25% - 35% and a significant competitive advantage in the market place."

About Gladstein, Neandross & Associates (GNA)
GNA is the leading North American consulting firm specializing in market development for low-emission and alternative fuel vehicle technologies, infrastructure and fuels for both on and off-road applications. GNA provides strategic market analysis and planning, technical assistance, and public affairs and policy support to clients in the private, public and non-profit sectors. For 20 years, GNA has pioneered the nation's largest and most innovative alternative fuel vehicle projects. In addition to its technical consulting practice, GNA hosts two of North America's leading alternative fuel and advance vehicle technology conferences -- the Alternative Clean Transportation (ACT) Expo and the High Horsepower (HHP) Summit. See additional information at www.gladstein.org.

About American Power Group Corporation
American Power Group's alternative energy subsidiary, American Power Group, Inc., provides a cost-effective patented Turbocharged Natural Gas™ conversion technology for vehicular, stationary and off-road mobile diesel engines. American Power Group's dual fuel technology is a unique non-invasive energy enhancement system that converts existing diesel engines into more efficient and environmentally friendly engines that have the flexibility to run on: (1) diesel fuel and liquefied natural gas; (2) diesel fuel and compressed natural gas; (3) diesel fuel and pipeline or well-head gas; and (4) diesel fuel and bio-methane, with the flexibility to return to 100% diesel fuel operation at any time. The proprietary technology seamlessly displaces up to 75% of the normal diesel fuel consumption with the average displacement ranging from 40% to 65%. The energized fuel balance is maintained with a proprietary read-only electronic controller system ensuring the engines operate at original equipment manufacturers' specified temperatures and pressures. Installation on a wide variety of engine models and end-market applications require no engine modifications unlike the more expensive invasive fuel-injected systems in the market. See additional information at: www.americanpowergroupinc.com.

Caution Regarding Forward-Looking Statements and Opinions
With the exception of the historical information contained in this release, the matters described herein contain forward-looking statements and opinions, including, but not limited to, statements relating to new markets, development and introduction of new products, and financial and operating projections. These forward-looking statements and opinions are neither promises nor guarantees, but involve risk and uncertainties that may individually or mutually impact the matters herein, and cause actual results, events and performance to differ materially from such forward-looking statements and opinions. These risk factors include, but are not limited to, the fact that our dual fuel conversion business has lost money in the last six consecutive fiscal years, the risk that we may require additional financing to grow our business, the fact that we rely on third parties to manufacture, distribute and install our products, we may encounter difficulties or delays in developing or introducing new products and keeping them on the market, we may encounter lack of product demand and market acceptance for current and future products, we may encounter adverse events economic conditions, we operate in a competitive market and may experience pricing and other competitive pressures, we are dependent on governmental regulations with respect to emissions, including whether EPA approval will be obtained for future products and additional applications, the risk that we may not be able to protect our intellectual property rights, factors affecting the Company's future income and resulting ability to utilize its NOLs, the fact that our stock is thinly traded and our stock price may be volatile, the fact that we have preferred stock outstanding with substantial preferences over our common stock, the fact that the conversion of the preferred stock and the exercise of stock options and warrants will cause dilution to our shareholders, the fact that we incur substantial costs to operate as a public reporting company and other factors that are detailed from time to time in the Company's SEC reports, including the report on Form 10-K for the year ended September 30, 2014 and the Company's quarterly reports on Form 10-Q. Readers are cautioned not to place undue reliance on these forward-looking statements and opinions, which speak only as of the date hereof. The Company undertakes no obligation to release publicly the result of any revisions to these forward-looking statements and opinions that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.