In my case, it would probably give me worse mpg, averaged over a year. The Insight's pretty low already, and if there's more than about 4-5" of snow on the roads, it becomes a very ineffective snowplow - which really kills fuel economy :-)
OTOH, I really wish I could figure some way to lower my Toyota pickup about 6", just to make loading it easier. Any mpg gain would be a bonus.
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