The extra inertia is only a liability if you don't use it for forward movement. If you coast down to a stop without braking, it's neither good nor bad. If you have to brake for a turn or a light, higher rotational inertia is bad because you're throwing it away. If you can change your driving to avoid braking you'll recover most of the possible losses.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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