XRAY - Model racing cars

i was looking at the manual and it says to run so many tanks on 1/4 throttle and so many on 1/2 throttle and so many 3/4 throttle my question is do you vary the rpms up to the specified throttle range or just set it and let it be ?

You can add full throttle for several seconds. You can actually run full throtlle all the time but you will need to have a very rich engine setting so the engine does not achieve the maximum RPM.

So on the first tanks 4-5 it says 1/4 throttle do I set it there and run through 4-5 tanks or do I vary throttle during those tanks to 1/4 throttle .then do the same on 1/2 throttle for 4-5 tanks etc