don't forget you need to add DEF to the price per mile.
Unless you're towing heavy (Probably unlikely with the Colorado) DEF is not a significant cost. The diesel SUV's that we service will go an easy 5-7k miles on 3 gallons of DEF, about $12.00 worth. My Cummins, OTOH, will drink a gallon every 500 miles when towing heavy. Normally get about 750-1000 mpg when running light.
