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For many fleets, onboard telematics has become an indispensable tool in the never-ending quest to improve fuel economy.

Nineteen fleets tracked by the North American Council for Freight Efficiency showed fuel efficiency improvements last year, for the ninth straight year, but the gain was just 1% year-over-year as some fleets dropped certain fuel-saving technologies and as other factors such as extreme summer heat played a role in fuel consumption.