Here's a question, XFi:
A determined hypermiler could probably achieve double the car's EPA combined rating with the car in its current, unmodified form (well, with a few prep. items like tire pressure...)
Now, that kind of feat could only be achieved at a pretty low average speed, in ideal conditions where the driver could operate more or less unmolested by other traffic.
But it does make me think the "doubling" requirement might need some context...
Under what kind of conditions are you striving for 58 mpg? If it's @ a steady 75 mph on the freeway, you may be in trouble. But if you'll deem 58 mpg @ 45 mph avg speed a success on a rolling country road, that's a horse of a different colour.
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