There was an F350 (?) Diesel that claimed some outrageous MPG as well - something 'probably impossible' in such a large, heavy, un-aerodynamic vehicle - 78 MPG or so. It has since disappeared from the garage, and most of the entries on the diesel page seem to be plausible. My guess was that the F350 was using some percentage of diesel (to start, or perhaps as a dino/veg mix) ans only reporting the dino burned in the MPG.
This is one of the reasons why I put the watt-hours per mile, and kilowatts used/miles driven on the refueling report - the MPGe of my Citicar is reasonably high, but the data supports the claim.
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