Asda has become the first of the big four supermarkets to invest heavily in aerodynamic trailers with the purchase of 173 of Cartwright's Cheetah model.
Trials suggested that the firm could save more than £1m on its fuel bill.
The order, comprising 100 curtainsiders and 73 box bodies, follows tests of one retro-fitted unit operating from its clothing distribution site in Northampton.
Although the firm saw fuel efficiency improvements of between 4.5% to 6% on the trailer, Chris Hall, Asda's network transport manager, says he expects the saving across the fleet to be slightly lower.
"The majority of our DCs have a lower stem mileage than our trial location," he explains.
He adds: "We will continue to monitor the performance of the new fleet over the coming months to assess their impact on fuel efficiency."
With an annual fuel bill in excess of £45m, Hall says that any improvement on mpg will pay dividends. He continues: "Even a small single digit percentage improvement provides a healthy return on investment.
"Our philosophy is all about driving fewer, friendlier miles. We have already achieved significant benefits through improving our vehicle fill and increasing our double-deck fleet to reduce total fuel usage," states Hall.
He explains that the company is within reach of its target of cutting CO2 emissions by 40% from the 2005 baseline by the end of the year.
This year alone, it has reduced road miles travelled by 9 million. "We are targeting something similar next year," Hall adds.