HaulingAss
Well-known member
- Joined
- Oct 3, 2020
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- Location
- Western Washington, USA
- Vehicles
- Cybertruck DM, 2010 F-150, 2018 Performance Model 3, 2024 Performance Model 3
With All-Terrain tires, in average conditions, my estimate is you would need to go 50-55 to hit the combined EPA range,I so suspect that you will be able to hit the EPA blended range at about 60 mph, just not 75 mph.
With the more efficient All-Season tires it would probably be almost 60 mph, a couple of mph slower. That's assuming only light breezes and warm/mild weather and roads of normal roughness.
On smooth pavement and mild/warm weather, it probably can hit EPA combined range at 60 mph, or maybe even 61 mph. On a large EV like Cybertruck, every mph makes an easily measurable difference when at highway speeds. Going only 50 mph in the same conditions it will be able to exceed it's EPA range by a surprising margin.
Note to future Cybertruck owners: When doing range testing always insure the 50 psi recommended pressure is measured stone cold. If the tires are already warm, add 4 psi. I have seen how little regard motorists have for their tire pressures in recent decades, so I have low confidence that many of the range numbers that have been endlessly bandied about have been with properly inflated tires.
If I were an automaker, I would include an inexpensive but durable and accurate tire gauge with every vehicle, just to remind customers that tire pressure sensors are not a substitute for a standalone air guage. Even if your air gauge is off by 1 psi, at least all four tires will be the same pressure (which is more important than that 1 psi). In tire pressure sensors normally vary from each other by at least one psi, sometimes two, which means if they all read the same, your actual pressures will not be. Always go by one gauge that measures all tires consistently and ignore the 1 or 2 psi differences on the display.
The problem here is that a pressure differential between the left and right tires on the same axle (motor) will cause the two tires to have different diameters and thus they will turn at different speeds. This causes the differential to "churn" in the gearcase oil, reducing efficiency.
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