- G ure v ich ▁Mi G - 2 5 , ▁with ▁two ▁engines , ▁to ▁reach ▁mach ▁ 3 . 2 , ▁although ▁the ▁engines ▁had ▁to ▁be ▁scra pped ▁after ▁a ▁flight ▁to ▁Mach ▁ 3 . 2 . ▁The ▁engine ▁had ▁a ▁very ▁high ▁fuel ▁consumption , ▁especially ▁at ▁low ▁alt itudes . ▁ ▁Vari ants ▁ ▁R - 1 5 - 3 0 0 : ▁ ▁Original ▁version . ▁U sed ▁in ▁T up ole v ▁Tu - 1 2 3 ▁Y ast reb ▁dr one . ▁ ▁R - 1 5 - 3 0 0 M ▁ ▁R - 1 5 B - 3 0 0 : ▁Electron ic ▁engine ▁controls ▁( the ▁first ▁for ▁the ▁Soviet ▁engine ). ▁and ▁modifications ▁to ▁increase ▁life ▁span . ▁Original ▁engine ▁for ▁the ▁Mi G - 2 5 P , ▁Mi G - 2 5 R ▁and ▁variants . ▁ ▁R - 1 5 BD - 3 0 0 : ▁Im pro ved ▁and ▁more ▁powerful ▁version ▁for ▁Mi G - 2 5 PD ▁and ▁Mi G - 2 5 P DS . ▁ ▁R - 1 5 BF 2 - 3 0 0 : ▁U pr ated ▁version . ▁U sed ▁in ▁Ye - 2 6 6 M ▁high - per formance ▁Mi G - 2 5 M ▁prototype . ▁Mi G - 2 5 M ▁aircraft ▁was ▁never ▁put ▁into ▁production ▁ ▁App lications ▁ ▁M iko yan - G ure v ich ▁Mi G - 2 5 ▁