Just filled up my Clarity after 1000 miles. Needed 5.9 gallons to fill the 7 gallon tank, for only $17.75. Probably could have milked it for a few hundred more miles, but I'm driving from DC to NY today, so needed a full tank. One question, however. When I bought the car, with a full tank, the range was something like 300 miles, which made sense. But now, after filling it up, it tells me the range is 730 miles. What does that mean? Could I drive for 730 miles without re-charging? I only have 39 miles of EV charge. How does it calculate this?