I cannot attest to your results, but it would be very very surprising.
The uberturbines have maybe a touch of aerodynamics to them, but they are hardly aero wheels. They are also NOTORIOUS range killers; something tesla even outright admits. The literal difference between the long range and the performance's 35+mile range difference is only the wheels/tires and nothing but the wheels/tires.
Plus, assuming you had the stock summer tires on the ubers and went to an all season (inherently less grip and roll resistance), I almost wonder the following: was your speedo adjusted? Just going to the all-seasons should have net you range (maybe not 0-60).
I only ask because countless tests have shown going from the 21" uberturbines on the Y performance to literally ANY 19" will result in an astounding pickup in efficiency, let alone 0-60 time. Its just physics. But if your speedo isn't recalibrate for the significantly smaller diameter... I guess that could explain it> Don't know what can possibly account for your experience. Aerodynamics matter, but your 21" are legit nearly 70lbs on the back and had a summer sticky...
Again, can't attest to your findings, and maybe you are experiencing something, but it pretty much defies the laws of physics.
First off, there is no reduction in tire diameter to speak of. A small reduction in the rear, not as much as the tire calculator shows. Call it 0.3" shorter in the rear, identical in the front. This is from measuring the actual tires mounted.
Second, I checked speedo calibration before and after by comparing speedo indicated speed to GPS indicated speed. GPS speed was measured both with a Dragy and with the internal sensor in the Note 10+. Both GPS units matched identically, and the speedo read just under a mile fast at 70 mph with all wheel & tire sets.
Third, my results do not defy physics. You claim the Uberturbines are not aerodynamic; can I see your test results or a link? I think my test results verify that the Uberturbines are in fact very aerodynamic.
Fourth, wheel weight has nearly zero to do with steady state cruise efficiency. It certainly will affect stop & go driving, albeit to a lesser extent than an ICE vehicle due to regenerative braking.
Fifth, I can find a lot of holes in the video tests I've seen. For instance, the videos I've seen claimed that 0-60 times improved when using M3 wheels & tires due to lower wheel set weight. Sorry, that's wrong. 0-60 times improved because the much smaller diameter tires improved gearing pretty dramatically. If the testers couldn't even figure that pretty simple thing, I really have no confidence in the rest of their test procedures and results. I did my best to eliminate or control all variables from the test, and I performed multiple tests with each wheel & tire set. I threw out any test where I encountered a condition that could skew the results. I tested until I had a minimum of five good tests. I keep written records of all of my long drives, and long term data collection is backing up the data I gathered driving my test loop.
My test results surprised me as well. I was expecting a large improvement in range; I did not get it. Now that I've had a chance to check the Tsportline TSTs with 255/45-19 Quatrac Pros, I find that I'm finally back to the same efficiency I was getting with the 21s. Yes, a 19" wheel should be capable of better range than a 19" due to the taller sidewall being more aerodynamic than a shorter sidewall. But that effect is negated if the 19" wheel itself isn't aero, or if the 21" wheel is very aero.
The 21" wheel setup is a notorious range killer only when compared to the notorious efficiency of the 19" geminis with hubcaps and LRR tires. Pretty clearly it's not a range killer compared to other inefficient setups.
Tire rolling resistance is also going to have a big impact. I only tested two 19" tires, the Bridgestone QuietTrack and the Vredestein Quatrac Pro. While the Vredesteins seem to have lower rolling resistance resulting in a 3% improvement in efficiency over the Bridgestones, they are both performance oriented tires and it's likely I could do much better if I was willing to sacrifice other performance characteristics for lower rolling resistance.
My choice of wheel width may be affecting efficiency as well. I chose 8.5" wide rims, Tesla chose 9.5" rims; It seems probable that Tesla chose that width for superior aerodynamics. Choosing a 245/45-19 tire to go with the narrow rims should improve both aerodynamics and rolling resistance. When my 255s wear out, I'll likely go that route.
My guess at this point is that the TSVs will have at least a 3% efficiency advantage over the TSTs. That's merely a guess though as I have not tested the TSVs. That's a tough choice. The TSTs will handle better and provide a better ride due to lower weight. All we know for sure at this point is that the Gemini wheel with hubcap is going to be the gold standard for range, but an extra 5% - 10% range isn't the be all end all for everybody. I think it's likely--and this is just a guess at this point given my test data--that the TSV wheels in 19 x 9.5" sizing should be very, very close in range to the stock Geminis--assuming identical tires.
