Ok; I was using 34.8 MJ/l, apparently from Oak Ridge National Lab, via Wikipedia. 114,500 BTU/gallon is 31.9 MJ/l, which explains why our numbers differed.
I really hope they're going to bring their efficiency up. That 33 mpg CO2 number could be quite damaging to its eco-reputation were it widely known. The trickle-down effect the smaller EV players wouldn't help matters either, even if their efficiencies were higher.
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