Start the game and create a user profile if one does not already exist. Enter the folder that corresponds to that user profile in the "\Documents and Settings\[user name]\Documents\Euro Truck Simulator\Save" directory and open the "game.sii" file with a text editor. Modify the value of the rpm_limit line as desired. Note: Your truck has nine gears. For example, a 15000 rpm limit will set your first gear km/h to about 75 and you will accelerate very quickly. It is highly recommended to use the manual transmission option for this trick. You also must do this for each new truck.