One of the mysteries of the Model 3 is the actual volume of the passenger cabin, which Tesla has not published. However, I believe we can infer the lower bounds of the cabin volume using available information. First, we know that the Model 3 is classified as an EPA Midsize car. EPA test docs posted to Electrek confirm as much: Tesla could be underselling Model 3’s range and charging capacity, reveals EPA document (see the FE label on p. 6 of the scribd hosted doc at the bottom of the article). EPA classifies a midsize car as having 110-119 cubic feet of interior space for passenger compartment plus cargo volume: Frequently Asked Questions A large car is 120+ cubic feet. This establishes a lower bound for the Model 3's cabin + luggage at 110 cubic feet. Tesla lists the Model 3 has having luggage volume of 15 cubic feet (including trunk and frunk): Model 3 Here's where things get interesting. EPA apparently does not count the Model S' frunk space as part of "cargo volume". Model S is listed as 94 cubic feet cabin, 26 cubic feet cargo: 2017 Tesla Model S AWD - 75D, while Tesla says that Model S has 30 cubic feet total storage in the comparison chart with Model 3: Model 3. As best I can eyeball it, Model 3's "frunk" is about 2 cubic feet. MOC's video shows the frunk has max width of 34", max length 18", and max height 9", but the space is irregularly shaped, like a tapered trapazoidal block. 2 cubic feet is my best guess. 15 cubic feet total - 2 cubic feet frunk = 13 cubic feet trunk. Assuming that Model 3's rear trunk is 13 cubic feet, this places the lower bound of the Model 3's cabin at 97 cubic feet!