Thanks for the response. My question was actually does the GDE tune increase fuel rail pressure for the same power output. For example, cruising down the highway at 70mph, is the fuel rail pressure the same between the OEM tune and the GDE tune? I was under the impression that the fuel rail pressure could be lowered by the ECU as conditions allow, but maybe I was mistaken?At full load GM limits rail pressure to 2000 bar, GDE does not change this. FYI, the fuel system in the 2019+ vehicles is rated for up to 2500 bar, but GM elected to not change peak fuel pressure above 2000 bar.