If it's like my truck...then half what I get without...125 miles?
We are going to need real world data with various types of trailers, boats, etc and at varied speeds, weather conditions, and terrain to make any kind of accurate assessment. I doubt if Tesla even has enough data to make an educated guess yet, and it will likely be at least a year before we have any kind of accurate picture. We will be reporting our findings when pulling a trailer, but since I don't expect to see our X until at least June of next year, it will be awhile before we can report anything.
We need higher capacity batteries. Hope they are coming soon.
There are a number of factors that contribute to reduced range with towing, such as:
- increased rolling resistance
- increased mass (for accelerating)
- increased air friction
Because the Model-X is so aerodynamic (when compared to other vehicles), air flow plays a big part in providing a long range. As soon as you disrupt that air-flow with a trailer, the range will be significantly impacted by air resistance.
Most tow-capable vehicles have the aerodynamics of a brick, so towing a trailer isn't going to make it much worse and hence the increased air resistance should be fairly negligible.
Assuming that all the other range-reducing factors between Model-X and other tow vehicles are the same, air resistance will be a significant difference. Therefore, most people in the Model-X forums tend to believe that the range impact will be more significant with the Model-X when compared to other ICE tow vehicles.
Since you will not, and can not, drive very fast when towing a trailer. That should make up some lost range. We do need real world date though.
A second battery in an RV would help counter the reduced range from towing and provide power to the RV when parked.
At the California speed limit for towing vehicles (55 MPH) you should be able to make it from one Supercharger to the next.
Much like truck speed limit of 55 mph.
I have nine trailers,from small utility, to a car/toy hauler, to a 10,000-pound boat that's14' tall on the trailer. Towing a large trailer generally cuts the mileage in our F-150's in half, or less. For example, towing a 5,000-pound 20' box trailer loaded to about 5,000 pounds with furniture, or containing our '52 MG-TD, cuts the gas mileage on our '15 F-150 Platinum from 20 MPG, to about 9 MPG. Trucks are designed to be more efficient when towing than the X is, because they require less aerodynamics to ensure range. Based on this experience, I would expect an X towing maximum load on a tall box trailer to be under 100 miles in good weather. We're not planning to get rid of the pickups anytime soon.
I did tow a very light boat and trailer behind our first MS for 2,600 miles, no problem, with about a 15% range penalty (documented in another thread with pictures). That rig weighed about 800 pounds total (Diamond aluminum utility trailer under a 10' Walker Bay RIB, with 9.8 hp Tohatsu outboard motor). However, that setup is super-low, with the trailer hiding in the car's slipstream. I cannot imagine actually relying on an X to tow our 20' box trailer, even empty, at 2,600 pounds, because its profile is like pulling a parachute - defeats the critical efficiency elements that make EV travel work.
Here is one of my ICE cars.
Should be pretty easy to determine range for specific loads. The dash has a display to show energy consumed.
Just load up your Tesla with the number of people and the trailer you are wanting to evaluate, and drive it around for a bit. Should give you the answer in just a few minutes.
Same with an ICE vehicle. Load it up, hook it up, and take note of the instant miles/gallon display available on most vehicles. Quick answer.
Trying to predict in advance precisely what your range will be is going to be difficult as you need to take into account elevation changes, smoothness of the driver, hypermile techniques, trailer aerodynamics, temperature, tire choice/pressure, wind, speed, condition of the battery, amount of heat/air conditioning used etc.
@aesculus and Pungoteague_Dave,
My parents owned 2 of those MGs in the early '50s.
Depending on the shape of the trailer, it might be possible to attach some kind of fairings to bridge the gap from the rear of the X to the trailer. These may be as simple as suction cup mounted spoiler-like devices to extend the slipstream, much the way the funky shape of the headlights on the Nissan Leaf deflect airflow around the mirrors.
Long distance truckers have been using such aerodynamic tricks for reducing overall drag on their rigs for decades.
The MS rolling friction contribution is about 140 wh/mile at 65 on level terrain. If the X weighs 5% more(a guess), rolling friction is more like 147. Double that with a 5000 lb. trailer and the overall rolling friction is about 300 wh/mile. The MS air friction contribution is about 180 wh/mile at 65mph with no wind. The MX has a bigger frontal area, so make that 190 wh/mile. Without a trailer the MX90D should get about 250 miles range at 65 mph. As P_Dave points out aerodynamics of the trailer are important and quite variable. Let's suppose that one is pulling a boat on a trailer that is not a big box but is largely in the wake of the X so that it adds only 20% or so to the air friction contribution. The total energy requirement for the X towing such an assumed load would be in the neighborhood of 500 wh/mile at 65 mph. If you assume that the 90 kWh pack has up to 85 kWh of available energy, you should expect less than 170 miles of range with the above assumptions. That's probably the best that can be expected.