[strictlypersonl]

As long as the camber stays within "normal" range, there's little effect. Even at 4 degrees, the speed variation is 0.1% And the change is not linear: At 1 degree the speed variation is probably 1/100 that.
Jaguar sedans are quite successful in combining good ride, smooth running and good handling, and almost every live axle car experiences more than 2 degrees misalignment under power. The old leaf-spring cars would wind up 4 or 5 degrees.