Frozen food distributor Yearsley Group is trialling five Mercedes Actros tractor units.
Yearsley has a fleet of more than 200 temperature-controlled vehicles including 12- and 15-tonne Mercedes Ategro rigids.
The five new tractor units are 460hp 2546 models and are fitted with Mercedes PowerShift 12-speed automated transmissions.
Edward Yearsley, operations director of Yearsley, said: "The Actros demonstrator proved fuel-efficient so we decided to try these Mercedes tractors. We will now assess them over the longer term against the rest of our fleet.
"We're also looking into a fleet management system for our trucks, to monitor deliveries and collections and provide detailed information on fuel use, braking, acceleration, engine idling time and other factors. That should help us build a more detailed picture of the vehicles' cost-effectiveness, as well as helping us to work more efficiently."
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