Quoting maximum electric range without considering the capacity of a car’s battery pack is the same as quoting the maximum driving range of a gasoline-fueled vehicle without considering how many gallons of gas the tank holds. The I-Pace’s battery pack is rated at 90kWh. The Model X’s smallest pack is 75kWh. So the Tesla can go about the same total distance as the Jaguar using significantly less energy.
It’s not just Tesla that boasts greater efficiency figures than the Jaguar. Chevy manages to eke 238 miles out of the Bolt EV’s 60kWh battery pack, and Hyundai gets 258 miles from the Kona Electric’s 64kWh pack.
These vehicles certainly don’t all play in the same market segments, and there are a lot of variables to consider. For instance, the Jaguar’s 4.5-second 0-60 rating is quicker than the Model X’s 4.9-second rating, and its advertised power output of 394 horsepower and 512 pound-feet of torque is higher than Tesla’s for the 75D (though Tesla’s actual power numbers aren’t really advertised in traditional hp and lb-ft figures). But even if cars like the Model X, Chevy Bolt, and Hyundai Kona EV aren’t directly comparable across the board, their range and battery capacity figures do help us understand the relative efficiency of each specific vehicle.
The efficiency of electric vehicles rated by the EPA is expressed as a MPGe (miles per gallon equivalent) figure. The 2019 Jaguar I-Pace’s figures of 80 city, 72 highway, and 76 combined MPGe don’t compare favorably with the Tesla Model X’s 91 MPGe city, 95 MPGe highway and 93 MPGe combined ratings.
It’ll be interesting to see how much EV buyers care about the Jaguar’s comparatively poor MPGe ratings, but they will definitely have an impact in the real world. In practical terms, what all of this means is that the Jaguar I-Pace is going to use more electricity per mile than the Tesla Model X. And that means it’s going to cost more to drive the same distance in the Jag when compared to the Tesla, or just about any other modern long-range EV that’s currently on the market.