The fuel needs to be higher octane

q4base or q4max?

q4base - IIRC, you cannot - id chose to limit si_fps to maximum of 90.

q4max - create a custom mode (see docs\Modes.htm) and set the "tickrate" setting. Eg, create the file: modes\fuel125.cfg:

overtime 1
timelimit 15
weaponrespawn 15
tickrate 125
gametype 7

Then set si_mode "fuel125"

Militia - Sorry, not tried it recently.

p0rt has been summoned!

Add fuel supplements.

Modify the server so it recognizes when someone wants to know tickrate and temporarily increases it to 125 during that short time frame (which we could call testing environment), and then have it return to 90 during normal play.