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Also, how much would using front wheel drive only affect vehicle stability and safety while driving on pavement? Inquiring minds would like to know. Guessing we are not going to know these answers until Rivian decides it is time to release their EPA numbers. Thinking, with deliveries beginning this month, its time to release this information.
most vehicles on the road are front-wheel drive. During fair-weather non-aggressive driving I doubt most people could tell the difference.

Now in situations with inconsistent traction (such as bad weather or loose gravel/sand) the AWD is going to be noticeable; and if you're pushing the vehicle through curves then torque vectoring is a huge advantage.

On a side note, I'm thinking that torque-steer -- something that affects most FWD vehicles that make decent power -- shouldn't be a problem for Rivian, even when operating in FWD mode, as I think the CV shafts are equal-length.
 

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I would assume that two wheel drive mode would not affect stability or safety when driving on the pavement. There are plenty of very safe 2wd vehicles out there. Never have I ever seen anything written that says 4wd is more stable or safe. My understanding is that 4wd only helps you during acceleration and forward traction. If you're really tearing around corners it might help there too, but this is an SUV. Tire choice has a far more meaningful effect on stability and safety when on pavement.
Torque vectoring absolutely helps when cornering. If you feel like driving in a spirited manner, you want to leave AWD on.
 

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Being OTA enabled I'd love to see a "rear wheel only" propulsion mode made available as well in the near future. It would be nice for trips and tooling around town doing local chores.
They are offering a FWD-only mode. Not RWD. There are physical disconnects on the rear axles that allow for this. The fronts are permanently connected so they'd create drag if they weren't always used for propulsion. For regenerative braking you also want the front motors, as they'll regen a lot more efficiently than the rear -- and it's safer to regen in the front, too. You don't want to cause the rear to lock up or lose traction, and that limits your braking/deceleration options there.

So, as much as a RWD "donut" mode would be fun, it really isn't practical. AWD for fun and spirited driving. FWD for eco.
 
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