I have this voltage regulator on my Challenger. I have a high amperage alternator, fuel injection, and in-tank electric pump. I do a lot of street driving and the charging doesn't appear to be any different than anything else. I see about 14 volts off idle. I have link below to a video I just made showing the charging voltage after cold startup.
AG.


https://youtu.be/FORcUFekZbk?si=1G0jKpp9JMEEF30p

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.