Looks like this can be done with one setting change in NRaas Retuner. The settings are under Sims3GameplaySystems > Sims3.Gameplay.Objects.Vehicles.CarMotiveMobile > kCommoditiesToUpdateMaxLevels > Index 3 > Value =70. We can't remove Energy from the list of motives the vehicle impacts, but it has an index of 3 and that maps onto max motive score of 70 so try setting just that one much lower (like at 10).
That path might not be exactly right, am not in-game and am going by the what its master tuning file says. Let me know if I need to expand on that a bit.
Although when my sims gain excess energy throughout the day, I usually have them read in bed or do something constructive like that until their energy motive decreases enough to be able to sleep.
