If an R2 user is 2.75 MPK, does that match with the vehicles long term average? More example my R1S is essentially 2.3 MPK, if I was hooked up to Roamer, would my value match the vehicle average or is there some other computation to land at 2.75?7% rejected?
your AI must have a short context window
Yes, all the more reason to get the more available tire size. Round and round we go.
How is it more available exactly? There's only 1 choice for for 20" or 21" since you're not going to replace a single busted 20" tire with something other than what Rivian puts on and have 1 tire different than the other 3.
13 > 1, pretty simple. As a temporary, emergency solution, it's ok, I've done it to get home.
finding a wheel that fits the bolt pattern and a tire that goes with it to get to the correct outside diameter is not exactly an easy emergency solution.
How about Rivian Roamer's own comments about HIS data, which closely match the EPA rated differences. For road trips the 21's are clearly more efficient.
This is your own graph. You think this shows a "Growing efficiency gap"?
What you want are multiple side by side tests.
Yes, descriptively it does. Statistically, we don't yet know whether the gap itself is significantly growing. As the dataset has grown, the expected 21" efficiency advantage has not emerged; instead, the observed difference has moved progressively in favor of the 20". If the vehicle-level confidence intervals now exclude zero, then we can graduate from “emerging” to a statistically demonstrated 20" advantage.
| Miles | 20" | 21" | Gap | 20" advantage |
|---|---|---|---|---|
| 25k | 2.70 | 2.68 | +0.02 | +0.7% |
| 30k | 2.72 | 2.70 | +0.02 | +0.7% |
| 40k | 2.78 | 2.73 | +0.05 | +1.8% |
| 50k | 2.80 | 2.74 | +0.06 | +2.2% |
At this point we can't identify any efficiency advantage to the 21" tires/wheels, it's rumored to exist but I looked for it using multiple test drives, sifting through the Roamer user data and asking users for their average long-term efficiency. What we know presently is on average there appears to be a slight 20" advantage of 1-2%. Looking at both setups, it's possible that high speed has negative aero effects for the 21s, so it may be once over ~70 mph the negative aero takes over and offsets any potential benefits of the 21s. I also think the sipping may have an effect. Ultimately, the 21s may ek out a slight advantage to 20s, I would underscore 'slight'...Get the tires/wheels that best suit your needs/wants.
