I'm on a Spartan and after start up hit the "on button" for cruise control and the cruise "set button" and the idle goes up to 1000rpm. I then hit the "Res+"and it will go to 1250. I do this all the time , faster warm up, faster air up and better for the motor.
2018 Dutch Star 4369 Spartan Chassis
2016 Jeep Cherokee, 1952 Willys CJ3A