Tesla Model X owner Bjorn Nyland provides us with perhaps the most detailed look yet at the Model X's towing capability, including how various trailer and other tow-behinds impact efficiency and range of the Model X.
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Nyland's general consensus is that towing has a huge impact on the efficiency (and thus total range) of the Model X. According to Nyland, energy consumption of the X can basically double when towing.
Nyland concludes that the low-line X, the 60D, can have range reduced to just 70 miles or so when towing a large load.
Officially, the Model X is rated to tow up to 5,000 pounds. However, Tesla doesn't exactly explain the impact of towing on range beyond stating that towing may reduce range.
"A short explanation and display of the different trailers I have pulled with my Model X. In general, the consumption goes up by around 50-100 %."