Low rolling resistance tires: are they worth it?

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Today is Earth Day and we saw fit to write about fuel economy, which is something we at Auto123.com take to heart. Many automakers have been using low rolling resistance tires (LRRT) for a few years. While mostly found on hybrids and electric vehicles, these tires are growing in popularity. But are they really worth it or is this a gimmick to steal some of your hard-earned money?