I came across a comment in Ohmman's "Favorite/Least Favorite" thread regarding energy inefficiency, thus: and it made me wonder whether this possibly could be some inherent defect of either the Model X or EVs in general. I do NOT think this is the case; rather, those of us driving Teslas have become acutely aware of our vehicles' energy consumption because the data displays are so much further advanced than in any ICE. The best that I know of in a traditional vehicle is "Instantaneous mpg" (terribly misleading and inaccurate enough to be fundamentally worthless), and "mpg since latest re-set" or some such. However, in that I am accustomed to hauling heavy loads many thousands of miles at a time over wretched roads, I can attest to the reality that my diesel F-350, in which when empty and on good roads I can attain 18mpg driving reasonably (60mph) and 22mpg driving parsimoniously (50mph), sucks up the fuel at 8-9mpg when driving 65mph, loaded, and on poor, hilly, and snowy roads. So there I have one fairly floppy datum of a difference in energy consumption of close to 3X. As usual, I'm presenting what is probably an outlier, but I think it could be valuable to have some more rigorous data concerning how fuel economy changes in ICEs as driving conditions change to less than ideal. Has anyone such material?