 In order to increase compression ratios in their engines, and unable to do so through the use of high-strength alloys and high-octane fuel lacking in Germany, engineers opted for chemical enhancements.The Bf 109 G-1 high-altitude fighter, powered by the DB 605A was given the GM-1 injection.The Fw 190 A-3 was introduced with improved BMW 801D-2 engines providing more power.