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In case you were wondering how these stack up to the Ram 1500, the 2WD Ram has a rating of 20 MPH City / 28 MPG Highway / 23 Combined. A V6 gasoline-powered Canyon or Colorado with 4WD has a 17 MPG City / 24 MPG Highway / 20 MPG Combined Rating. The efficiency advantages to the diesel are real. Even when adjusted for a higher average price for diesel the Duramax will likely still be ahead ion terms of fuel economy (fuel cost per mile) as well. Range with the dual tanks in the trucks is also amazing. GM says the trucks can go 651 miles (maximum) without refueling. The cost adder for the Duramax over a V6 truck is about $3,730. Obviously that buys a lot of regular unleaded. Luckily, the Duramax has advantages beyond just fuel efficiency. Towing being the most notable. One aspect of which is smart diesel exhaust braking. This type of braking enhances vehicle control and reduces brake wear by reducing the need for breaking on downgrades according to GM. Duncan Aldred, vice president of GMC Sales and Marketing commented on the Duramax trucks, saying, “GMC's Canyon is designed for those who want a smart-sized premium pickup that is quiet, capable and efficient and the new Duramax diesel engine gives customers another choice for handling heavier work and recreational needs – while doing it efficiently. It’s the very definition of GMC’s professional grade ethos.” Sandor Piszar, director of Chevrolet Truck Marketing offered up his two-cents, saying, “The Colorado Duramax diesel is in a league of its own. Colorado’s gas models already led the segment in fuel efficiency, and the new diesel – which no other non-GM competitor offers on a midsize truck – gives customers even greater freedom to go where they want with fewer fill-ups.” The Canyon we drove recently was loaded and had an MSRP of $45K. Expect shipments to dealers to begin any day.