No, BUT. Please read the note at the end.
Pressure is heat. Higher pressure means there is more heat in the system, and your radiators will operate at a higher temperature.
Lowering the temperature, and therefore the pressure, will mean that your radiators will run at a lower temperature, but your boiler system will have to operate longer at that lower output in order to keep your home at the desired temperature. There isn't any sensible gain to by had by doing this.
If you want to reduce your fuel consumption, add insulation.
PLEASE NOTE, 10 bar sounds kind of high for a home heating boiler and equates to about 345 degrees F / nearly 175 C, are you certain you're reading that right?