Back in 2006, Kenworth Truck Co. launched what was then considered to be its “flagship” highway tractor, the T660, largely due to its fuel efficiency footprint. Now, a decade later and after 60,000 units built and sold, Kenworth is officially putting the T660 out to pasture with a limited “last call” allotment of 500 units to be produced by year’s end before production ceases. “We want to give our excellent customers one last chance to own this industry favorite,” Jason Skoog, Kenworth’s assistant general manager for sales and marketing, noted in a statement.