Here are my longer savegames as requested for balancing.
here is my savegame (still ongoing, now 1957), started in 1930: it feels like my cars are really overpowered already, 1200cc 3 inline with torque and rev rating zero, fuel economy 65 and all emission ratings on 10 just to get the power down, still makes 94hp and 151nm torque
1973 save started in 1900