The in-game engine power of the M53/59 - “Ještěrka” in the russian tech tree incorrect. On the Wikipedia, War Thunder Wiki and Weapons System Database it says that the vehicle had engine with 110hp at 2,200rpm, hovewer in-game engine power in realistic battles is only 97hp at 2,200 rpm.
Sources: M53/59 | Weaponsystems.net
M53/59 - War Thunder Wiki